I recently bought a used 99 Mustang Gt. I took the car to a shop had it inspected and oil changed. They said everything was great, the exhaust was loose and they had to heat it up and tighten it. A concern of the mechanic was the exhaust setup. They say because of the set up the fumes will heat up the fluid in the differential and cause more problems if its not watched carefully. There is a picture of it below. I was wondering if this something to be careful of, they suggested getting it to go all the way out the rear. I love the sound of the car and wouldn't want it to change too much. Its due for emissions in June. Should I take the advice and have it sent out through the rear?

http://img33.imageshack.us/i/imag0065zk.jpg/

Here is a list of the exhaust mods
Exhaust:
SLP stainless steel coated long tube headers
SLP stainless steel x pipe with race pipes/cats
Bassani stainless steel mufflers/pipes turned down at the axle
SLP stainless steel polished tips

 

So they're saying because the exhaust is so close to the differential that it will heat up the fluid? If so, i've never even heard that. I guess anything is possible, but that just seems off to me.

BTW, i see that you have SLP tips in your sig. So does that mean you have the rest of the piping to complete the cat back?

 

I'm not sure. I bought the car a few days ago and i'm not too smart in this field. He gave me a bunch of pipes and stock parts with the car so maybe. About the fumes heating up the differential, I guess I wont take it to seriously but I will still keep my guard up. I'm curious if the car would pass emissions with the setup. He said it has an 02 cheater but idk if that is just for check engine light. Like I said i'm not familiar with exhaust systems and pretty much cars in general. I wanted to buy a stock mustang and work on it as I learn more but I took what was available. Any help is welcomed.

 

No the mechanic is right halfway from my expirience. The exhaust heat will heat up the fluid and loosen it up and make problems, however it will do that only if you don't have the turn downs. You have those, so I wouldn't be so worried about it.

 

My setup is just like yours. I hate all the exhaust resonating back up through the car, but from the outside it sounds pretty good. Also if you let it warm up any during the winter you will get a lot of exhaust fumes in the car. I learned that one the hard way last winter. As far as emmissions go it depends on what the standards are in your area. Here they are supposed to visually check for cats but then they just plug in to OBDII to look for codes.