Seeking Advice: Most Quiet muffler for boosting

[Harmony]

Whats the most effective and quietest muffler I can use while boosted. I currently have 2 magnaflow mufflers. One with a 2.5" straight thru core for when I'm boosting, and the other, a recent addition--a 2.25" straight thru muffler for NA.

The 2.25 has been chocked enough for me to know that its not ideal for boosting.
Anyway, my biggest concern is noise levels. My dad got a ticket for exhaust last year, and I got one right after going to court for him, for that ticket. It pissed me off enough for me to get the 2.25. But that muffer interior diameter isnt ideal for boosting.

So whatmuffler do you guys recommend. I have a 2.5" downpipe. I know most of you would suggest a 3" muffler, but I will only accept this if there is no other option. My system is a rear mount T4, so the 2.5 downpipe vents it immediately, making it an ok size to combine with a 2.5 muffler. I dont redline anymore , and since this is a DD, I dont need to make 450whp like most of you aim. Low boost, midrange rpm power is what i was after.

[A32]

you thought about making it a stock mufflerfor n/a and just doing a cutout for boost app.? or it wouldnt work? im just wondering cuz i was thinking about doing tyis becuase tue loud muffler is not appealing to me anymore. also do you use your "silencer" for your muffler or no?

[nismomaxgtr18]

I would recommend the Apexi World Sport series. They are relatively quiet systems.

[redcross631]

dynomax vt muffler....someone on the big org did a review on it ...check it out
LINK TO THREAD

[Harmony]

Originally Posted by A32

you thought about making it a stock mufflerfor n/a and just doing a cutout for boost app.? or it wouldnt work? im just wondering cuz i was thinking about doing tyis becuase tue loud muffler is not appealing to me anymore. also do you use your "silencer" for your muffler or no?

The Stock muffler is the uggliest/heaviest thing. The first muffler is a magnaflow 14851. The second (NA) muffler for whatever reason isnt on the magnaflow site, and I cant remember the number. It looks just like 14814, but the tips are straight, rather than slanted. Neither of those mufflers can use a silencer(I've never liked the look of mufflers with silencers. It somewhat like saying, I'm all muscle, but have a little dick. lol)
Magnflow listing: http://www.magnaflow.com/02product/streetmufflers.asp

With those mufflers, the car looks complete. A stock muffler at this stage would just look pathetic. Moreover, I only have about 1.5feet(or less) from the turbo to the muffler, depending of course on the length of the muffler. I mean you have a pretty good idea there. Maybe it can be done, just with a different muffler. But then again, this is a daily driven boosted car that was built as such. I built it to deliver low boost under 3k, instead of the dyno sized boost that starts to spool at at 4k. What I'm basically saying, is that it will hit boost a lot in DD, so I will have to keep hitting the switch for the cutout, making it less than practical.

[Harmony]

Originally Posted by redcross631

dynomax vt muffler....someone on the big org did a review on it ...check it out
LINK TO THREAD

YouTube - Dynomax VT 17157 on a Maxima

Thanks man. That's the sort of thing I'm looking for. The inlet design is great, but the exterior sucks. I've always like dynomax. before I started running magnaflow, I recommended dynomax to everyone. I still have one of their mufflers in my garage. I remember when I first saw the VT muffler, I thought it was an excellent idea, but I really disliked the design. Worst, I didn't consider it because it has an offset inlet, which would mean that I would have to redesign my downpipe(that was difficult enough the first time).

It may be time top just redesign everything from the turbo back. Maybe a 3" downpipe, and the 3" VT muffler. If I remember correctly, I think I had some clearance problems years ago when I built the downpipe. I think I settled on 2.5 because anything larger would have hit the frame behind the wheel. I'll have to look into it again.

I'll add another question: what do you guys think about a 3" muffler, vs the 2.5" I've been running. Will it really make a difference. If the vanes in the VT cause it to run quiet, then perhaps I can step it up to a 3". But will I be rewarded with more power?

[DanNY]

add in the longest resonator you can fit in there. so it's like a pre muffler to the actual main muffler. if you can add two resonators that will help even more but i doubt you have the space.

you can get a 2.5" or 3" system and keep it quiet with the resonators. just keep in mind that since it's a flow through design (less restrictive) it will make noise...but it doesn't sound like a rice rocket.

[Harmony]

Originally Posted by DanNY

add in the longest resonator you can fit in there. so it's like a pre muffler to the actual main muffler. if you can add two resonators that will help even more but i doubt you have the space.

you can get a 2.5" or 3" system and keep it quiet with the resonators. just keep in mind that since it's a flow through design (less restrictive) it will make noise...but it doesn't sound like a rice rocket.

I would have done it a long time ago, but there's no room there for a resonator. The down pipe really isnt that long, and unfortunately I can't eliminate the downpipe for a resonator. Due to the angle of the turbo, the down pipe has to go through a few turns and angles, and by the time it straightens out, I have maybe 5"(or less) of straight space before any muffler.

[packetattack]

Harmony, moved to IH&E section for you.

[DanNY]

Originally Posted by Harmony

I would have done it a long time ago, but there's no room there for a resonator. The down pipe really isnt that long, and unfortunately I can't eliminate the downpipe for a resonator. Due to the angle of the turbo, the down pipe has to go through a few turns and angles, and by the time it straightens out, I have maybe 5"(or less) of straight space before any muffler.

how is the pipe traveling from the DP to the rear section?
i mean generally there's a good distance of a straight pipe after the cat before it makes the turn around the gas tank. you can fit a decent resonator in there..no?

do you happen to have a pic of the set up?
i believe they do make shorter resonators...BUT i'm not sure how much it will dampen since it's so short.

[din9lebrah]

I would say cattman 3" (or a used 2.5", since they arent made anymore), only because it is "claimed" to have the most packed and channeled fiberglass than any other "performance" exhaust system designed specifically for a maxima.

I'm giving this based on what I read from Brian himself, no practical knowledge and/or experience.

Good luck.

[Harmony]

Originally Posted by DanNY

how is the pipe traveling from the DP to the rear section?
i mean generally there's a good distance of a straight pipe after the cat before it makes the turn around the gas tank. you can fit a decent resonator in there..no?

do you happen to have a pic of the set up?
i believe they do make shorter resonators...BUT i'm not sure how much it will dampen since it's so short.

I see where the confusion is. Its a Rear mount turbo system. The turbo is in located right after the rear beam(or axle for reference).

Check out pic 8 here: http://forums.nycmaximas.org/showthr...highlight=9psi

[DanNY]

Originally Posted by Harmony

I see where the confusion is. Its a Rear mount turbo system. The turbo is in located right after the rear beam(or axle for reference).

Check out pic 8 here: http://forums.nycmaximas.org/showthr...highlight=9psi

holy cow...ok sorry that clears things up. i thought it was a regular turbo and was like...enh?

this is the only thing i can think of in a very short distance. it's a twin pass muffler...so the exhaust gases passes the resonator twice before it goes out.

http://hytechexhaust.com/muffler/muffler.htm

i have zero experience w/ this company or with this product....but in theory it makes sense.

[Harmony]

Originally Posted by DanNY

holy cow...ok sorry that clears things up. i thought it was a regular turbo and was like...enh?

this is the only thing i can think of in a very short distance. it's a twin pass muffler...so the exhaust gases passes the resonator twice before it goes out.

http://hytechexhaust.com/muffler/muffler.htm

i have zero experience w/ this company or with this product....but in theory it makes sense.

I've seen that muffler before. You're right, in theory, it does make sense. I'll have to look into it. It certainly looks a lot better than the Dynomax VT muffler. My only concern is how fast the air is escaping with a muffler like that, that loops. The reason people use a 3" downpipe and 3" muffler when boosted, is to get rid of the spent air as quickly as possible. With a muffler like that, its like having a really long downpipe. If I were to get this muffler, it would definitely have to be a 3". Anything less would cause backpressure and choke the system.

Off topic, their website is crappy. No prices, pics cannot be expanded, etc. I think Megan racing makes a similar product. Hypertech promises 40whp by purchasing their headers(runs all the way to muffler) for a V6 eclipse. What? No freaking way. My brother has a 3.0 eclipse. There is no way an exhaust upgrade will yield that much power; Certainly not at the wheels.

[DanNY]

Originally Posted by Harmony

I've seen that muffler before. You're right, in theory, it does make sense. I'll have to look into it. It certainly looks a lot better than the Dynomax VT muffler. My only concern is how fast the air is escaping with a muffler like that, that loops. The reason people use a 3" downpipe and 3" muffler when boosted, is to get rid of the spent air as quickly as possible. With a muffler like that, its like having a really long downpipe. If I were to get this muffler, it would definitely have to be a 3". Anything less would cause backpressure and choke the system.

Off topic, their website is crappy. No prices, pics cannot be expanded, etc. I think Megan racing makes a similar product. Hypertech promises 40whp by purchasing their headers(runs all the way to muffler) for a V6 eclipse. What? No freaking way. My brother has a 3.0 eclipse. There is no way an exhaust upgrade will yield that much power; Certainly not at the wheels.

IMO you're over thinking it. your turbo is a big muffler by itself. the distance the exhaust travels from the turbo out to the tailpipe is pretty short. that muffler is no different than having a few mandrel bends in your exhaust but it travels the muffler twice in a 1 muffler set up which you need since there's space limitation. how much boost are you looking to get that you feel you need 3"? again IMO 2.5 is perfectly fine in your set up. lastly air flow = noise. cant have high flow and no noise.

also you're buying a muffler...not a web design company. i want a crap website so i know they have lower over head.

[Harmony]

Originally Posted by DanNY

IMO you're over thinking it. your turbo is a big muffler by itself. the distance the exhaust travels from the turbo out to the tailpipe is pretty short. that muffler is no different than having a few mandrel bends in your exhaust but it travels the muffler twice in a 1 muffler set up which you need since there's space limitation. how much boost are you looking to get that you feel you need 3"? again IMO 2.5 is perfectly fine in your set up. lastly air flow = noise. cant have high flow and no noise.

also you're buying a muffler...not a web design company. i want a crap website so i know they have lower over head.

I just listened to a few sound clips on and I'll weigh the options by the weekend. The one you suggested does not list an overall length. A similar OBX muffler states that the body is 10", but the overall length is 26". I dont have that much room in there for a muffler that long. I think my current mufflers are 18"(tips included).
It doesnt make sense for that muffler to be 26" long, unless they are adding the length of the second tube on the side to the overall length given.

I've taken my muffler off, and with the turbo alone there, its still pretty loud. I know people always say that the turbo quiets it down substantially, but on my car, its still loud without the muffler. Maybe if a downpipe is added and extended to the bumper it would channel the sound and make a difference. But with the downpipe simply disconnected, its still pretty loud.

As far as boost levels, I've always had a 9psi spring. I always though the 2.5 was perfect. The reason I considered a 3", is because of the extra tubing in the Hypertech muffler. Also, back in my mx6 days, guys were running 3" catbacks on their boosted setups. They seemed to gain over the 2.5". I have to wonder though if it was really justified to go 3" on that small motor (2.2 & 2.5).

[DanNY]

they use 3" for a normal turbo set up under the hood. that 3" carries the exhaust through the length of the car. you got about a 2 ft on your exhaust (after turbo) doesn't have to travel that far.

[nismo_star]

Vibrant Ultra Quiet resonator, which is an oval style, it is hands down the quietest resonator. It can be placed where you factory muffler used to be. Would recommend you get a 3".

[Harmony]

Originally Posted by nismo_star

Vibrant Ultra Quiet resonator, which is an oval style, it is hands down the quietest resonator. It can be placed where you factory muffler used to be. Would recommend you get a 3".

Thanks for the suggestion. Thats 3 mufflers to consider. I listened to a few sound clips. Seems like a lot of civics run that muffler. One max can be seen here:
But its loud, due to a 3" system.
The vibrant looks good too; much better than the Dynomax VT.

But you just suggested a 3". Why, considering what Danny stated in his last post?

[nismo_star]

vibrant mufflers are deep toned. vibrant resonators are truly noise reducers.
something I built over a year ago simply 3" muffler w/ a vibrant muffler, deep tone as hell, sounded like a subaru going up and down the block, made 475fwhp/330tq on a bone stock bottom end.
built a similar system using the same muffler and ultra quiet resonator, which was half the loudness compared to above video. My personal B13 used a vibrant ultra quiet resonator on a side exit, which was quieter than when I made it a full turboback system w/ a 3" Thermal Exhaust muffler, after getting tickets for a side exhaust in police terms, non d.o.t compliant modification t0 exhaust.

[dineth00i30]

Wow i have so many questions about rear turbo setups and why would some do one or what are the pros/cons but thats going to derail the thread so no. lol

[FuLLaH]

Originally Posted by redcross631

dynomax vt muffler....someone on the big org did a review on it ...check it out
LINK TO THREAD

YouTube - Dynomax VT 17157 on a Maxima

I like this muffler as well. My boy has it on his turbo Sentra and when he's out of boost or the car is idling is sounds almost like a stock Sentra!

[Harmony]

Originally Posted by dineth00i30

Wow i have so many questions about rear turbo setups and why would some do one or what are the pros/cons but thats going to derail the thread so no. lol

I think I listed a few of them here(and that was years ago. That list has grown now): http://forums.nycmaximas.org/showthr...highlight=9psi.

I would be more than happy to help. I just typed a page full of info, and then hit delete, because as you stated, it will derail this thread. If you create a thread, I can provide as much input as the past years have given me.

[dineth00i30]

Originally Posted by Harmony

I think I listed a few of them here(and that was years ago. That list has grown now): http://forums.nycmaximas.org/showthr...highlight=9psi.

I would be more than happy to help. I just typed a page full of info, and then hit delete, because as you stated, it will derail this thread. If you create a thread, I can provide as much input as the past years have given me.

I will PM you soon. Im mostly instrested in the way the air flows through the system.

[yay0]

I 2nd the vibrant resonator/muffler. I got a 3" turboback w/ a 3" metal core cat and 1 vibrant bottle style resonator. At WOT it gets loud but cruising its bearable. If you want a little more sound deadening they have ultra quiet versions also.

Also i wanted to ask you if you still have the wideband in that same spot you had it when you made your original build thread. Having it that far down the exhaust stream will affect your readings man.

[Harmony]

Originally Posted by yay0

I 2nd the vibrant resonator/muffler. I got a 3" turboback w/ a 3" metal core cat and 1 vibrant bottle style resonator. At WOT it gets loud but cruising its bearable. If you want a little more sound deadening they have ultra quiet versions also.

Also i wanted to ask you if you still have the wideband in that same spot you had it when you made your original build thread. Having it that far down the exhaust stream will affect your readings man.

Yeah, the wideband is in the same spot as it was during the original build. The innovate instructions said to install the wideband after the turbo to avoid pressure damaging the sensor.
Are you suggesting it be closer to the turbo(still located after the turbo), or pre-turbo altogether?