exhaust mods

[thre3kgt811]

ive heard many different things regarding what exhaust mods do what..i just wanna put an end to it all and find out the truth..if u put a full exhaust system on a stock SL how much would u gain in hp if any and how much low end power would u lose if any

[PoorLuder]

Originally Posted by thre3kgt811

ive heard many different things regarding what exhaust mods do what..i just wanna put an end to it all and find out the truth..if u put a full exhaust system on a stock SL how much would u gain in hp if any and how much low end power would u lose if any

That question has alot of variables to it. Before upgrading the exhaust, you should definitely get a new intake otherwise you will lose more backpressure and low-end torque. It also depends what kind of exhaust you get and how large the piping is. Bolt-on mods generally don't give you significant gains. You might be looking at 8-10 hp if you include the intake. However, I really am not the expert on the matter so don't take my word for it.

[xXxRocker5150]

There's an exhaust comparison in the FAQ section, it's good stuff...

[Thourun]

Just buy a VR4 exhaust and test pipe and a 9" K&N intake, all for less than $200 (not including shipping).

[sLADe781]

I've been wanting to get a VR4 exhaust system but haven't been able to find one. Anyone selling one here? Also, I was actually just talking to my friend today and he was telling me that he got an exhaust system that was bolt-on. I always thought that a whole system would require welding!?! :o/

[Thourun]

There should be a part out thread on 3SI with them, otherwise just make a post in the parts wanted thread. I think you just bolt them up and the seals are made with gaskets instead of welding. I havent heard much about the hangers that support the piping but they shoudl be easy aswell.

[Igovert500]

Most aftermarket exhausts like ATR and borla are bolt-on

[00blackzx3]

my custom cat back on my sl (stock piping is 2 1/4 and i got 2 1/2 put on, i lost ALOT of torque. I have duals out of a flowmaster muffler.

[thre3kgt811]

Originally Posted by Thourun

Just buy a VR4 exhaust and test pipe and a 9" K&N intake, all for less than $200 (not including shipping).

how much hp approximately do u think this could give me? and would i lost any low end power?

[stfuad]

The less backpresure there is, the less low end torque you have. Though on the higher RPM range you'll benefit more. If you really want improvments get a mandrel bent cat-back single exit exhaust, with a high flow cat. It'll cut down on weight, free up any air flow restrictions, and stuff. As far as the size, for NA's its not bad staying stock size.

[Stealthee]

http://www.suthnr.com/garage/mods/exhaust/index.html

There is everything you need to know about putting a VR4 catback on a NA.

As for losing low end torque I dont buy it one bit. Backpressure is simplely overrated with these cars. I was running with a broken dp for over a year and I lost almost zero torque. I just installed a 3sx dp last weekend and figured I would pick up a little from having a whole exhaust again. I picked up nothing but top end. BTW 2.5" is stock exhaust size on NA's.