Guys,
I had a full catback exhaust installed about 2 months ago on my 07 Max with CVT, in addition to an already installed y-pipe. When I first had this installed, the drone was unbearable. Then the exhaust tone changed and was very tolerable for a while. Now the tone/drone of the exhaust changes daily, and sometimes even within my 45 daily commute. At first I thought I was crazy, but this happens daily now. It goes from unbearable to managable, and most times it is at the louder level. Most times I have to switch to tiptronic so I can drive in 5th gear at a higher RPM because it's so loud. When it's loud, it sounds like there is an exhaust leak somewhere. I put the car up on jackstands tonight and checked everything, and found no leaks anywhere. Can anyone provide any insight on what may be causing this, as I need to get this fixed ASAP. When it's quiet it sounds great, but that is the exception lately. On a related note, should my stainless mufflers be rusting as in the below pictures after 2 months, as I'm starting to think I might have bought an inferior product. Sorry if pictures are screwed up it's my first time posting pics. Please help. Thanks.