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Old 02-14-2011   #1
DaFamCar
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Which exhaust size!?.....

Watup Fam,

I'm buying the resonator and cats for my exhaust but I don't know what size I should go with.... 2.5" or 3"...... I dont want my exhaust to be to loud but I do want I nice tone, what do you guys recommend!? Thanks in advance

Oscar R.


PS- Does anyone know what size is our exhaust in stock trim!?
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Old 02-14-2011   #2
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Re: Which exhaust size!?.....

stick with 2.5" if you don't plan on going boosted in the near future....3.0" is best for when you're boosted...but that doesn't mean you can't get it, there's just no point in going 3" on a N/A

when you say a nice tone but not loud, what exactly do you mean? the throaty VQ sound/tone?

y not get a full catback? just curious
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Old 02-14-2011   #3
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Re: Which exhaust size!?.....

I think is 2.5", not %100 sure. Hopefully the exhaust gurus will chime in soon
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Old 02-14-2011   #4
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Re: Which exhaust size!?.....

3" are for boosted cars i s pretty much history now. You can run them no problem if you want.

I know if im getting a catback im going 3". Might as well.
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Old 02-14-2011   #5
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Re: Which exhaust size!?.....

Quote:
Originally Posted by redcross631 View Post
stick with 2.5" if you don't plan on going boosted in the near future....3.0" is best for when you're boosted...but that doesn't mean you can't get it, there's just no point in going 3" on a N/A

when you say a nice tone but not loud, what exactly do you mean? the throaty VQ sound/tone?

y not get a full catback? just curious
^ what he said I'm still in the learning process and wouldn't wanna mislead you, but what red said is correct

^
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Old 02-14-2011   #6
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Re: Which exhaust size!?.....

Go with the 2.5 inch. If you have power mods, then 3inch. (intake does not count)
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Old 02-14-2011   #7
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Re: Which exhaust size!?.....

3' cattman catback All day !! FTW !!!
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Old 02-15-2011   #8
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Re: Which exhaust size!?.....

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Originally Posted by 03jmax View Post
3' cattman catback All day !! FTW !!!
Just bought mine today! hitting an extension ladder at 70mph will help you make the decision to upgrade your exhaust lol
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Old 02-15-2011   #9
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Re: Which exhaust size!?.....

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Originally Posted by sergofast View Post
Just bought mine today! hitting an extension ladder at 70mph will help you make the decision to upgrade your exhaust lol
Yes sir one of the best mods ever done to my car .
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Old 02-15-2011   #10
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Re: Which exhaust size!?.....

Quote:
Originally Posted by redcross631 View Post
stick with 2.5" if you don't plan on going boosted in the near future....3.0" is best for when you're boosted...but that doesn't mean you can't get it, there's just no point in going 3" on a N/A

when you say a nice tone but not loud, what exactly do you mean? the throaty VQ sound/tone?

y not get a full catback? just curious

where do u get your info brother?

do u know there are dyno proven results showing signifigant gains with 3in piping? compared to 2.5
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Old 02-15-2011   #11
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Re: Which exhaust size!?.....

First off all what's ur budget? There's tons of exhaust out there. The cheaper u go the expensive it gets to have a nice deep tone... I had cattman on both of my maxes I just love that exhaust.. and for ur stock exhaust the piping is 2"...
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Old 02-15-2011   #12
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Re: Which exhaust size!?.....

Moved to tech section, prefix added.
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Old 02-15-2011   #13
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Re: Which exhaust size!?.....

Quote:
Originally Posted by redcross631 View Post
stick with 2.5" if you don't plan on going boosted in the near future....3.0" is best for when you're boosted...but that doesn't mean you can't get it, there's just no point in going 3" on a fully stock setup

when you say a nice tone but not loud, what exactly do you mean? the throaty VQ sound/tone?

y not get a full catback? just curious
fixed....that's what i meant to say....my apologies for the incorrect info/any misunderstandings

Quote:
Originally Posted by 90max View Post
where do u get your info brother?

do u know there are dyno proven results showing signifigant gains with 3in piping? compared to 2.5
thnx for pointing that out alex...
you're right about the proven dyno results bro....i've read it before....however i don't think the that would apply to this particular case since the OP is on a fully stock setup....feel free to correct me if i'm wrong
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Old 02-15-2011   #14
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Re: Which exhaust size!?.....

wow thanks to all who posted^^^^ well it is a stock set up, the only "mod" it has is a '01 swap on a '99 wit a 5spd, feels like a open diff, intake and straight piping from headers back...
oh and how many cats should I get, cuz someone told me that in stock trim they have 4 cats plus the resonator

Last edited by DaFamCar; 02-15-2011 at 08:13 PM.
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Old 02-16-2011   #15
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Re: Which exhaust size!?.....

honestly ever little bit helps... 3in i feel will help any max... gl on ur choice but understand 3in will giv u a very deep kinda loud max
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Old 02-16-2011   #16
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Re: Which exhaust size!?.....

^^^^^^^^Thanks 90max, that's what i believe is on it now, a 3"but I just wanted some suggestions.
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Old 02-18-2011   #17
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Re: Which exhaust size!?.....

........so..... does anyone know how many cats our cars come with!? or how many do u guys recommend I get?
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Old 02-18-2011   #18
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Re: Which exhaust size!?.....

with 3" on a N/A car you will lose a little low end torque.
IMHO 2.5 is ok for a stock-ish set up. if you plan to go for more mods then 3".
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Old 02-18-2011   #19
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Re: Which exhaust size!?.....

Quote:
Originally Posted by DaFamCar View Post
........so..... does anyone know how many cats our cars come with!? or how many do u guys recommend I get?
Depends Cali or federal spec.. Cali spec has pre cats so basically is like having 4 cats. Federal emission if I'm not mistaken it has one precat and one big cat. I never had a fed spec so I don't know much about this. If u go headers u automatically gonna have one cat that's the main cat after the y pipe.
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Old 02-20-2011   #20
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Re: Which exhaust size!?.....

correction guys.... I have a 2.5" exhaust, I jus checked underneath n measured it.... Sorry, n thanks MaxBoy for the info..... keep 'em coming guys, Thanks in advance
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Old 03-22-2011   #21
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Re: Which exhaust size!?.....

lol its 3 cats or 1 cat Fed spec has one traditional cat after front pipe (Y-Pipe) Cali Spec has 2 pre-cats on each bank and the traditional cat after front pipe. When you mention 4 of anything on a Maxima it will be the oxygen sensors that are being referred to, usually seen on most OBDII vehicles that have separated exhaust banks, even some inline 4 and 6 motors. Most Fed Spec vehicles had 1 to 3 oxygen sensors depending on set up.
Would suggest you buy a Catmann exhaust and call it a day, no need for any additional cats.
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