Curious if a 4th gen aftermarket exhaust will fit on a thirdgen. Also why alot of the categories are split up for 93-97 then 98-02.

 

93-97 is the LT1, 98+ the LS1.

JamesC

 

The flowmaster on my 89 vert came off an LT1 Car.From what Ive heard you can use a 93-96 exhaust on a third gen.Just have to change the hangers on the exhaust.Shouldnt be a problem for any muffler shop to do

 

ah perfect, thanks! how about the 98-02? same things? just hangers..

 

So i could put a 4th gen cat back onto my car because i have seen a borla muffler with polished tips on craiglist

 

thats great news to me, saw a magnaflow with signature tip @ the yard on a 96.im on it in the morning

 

A 93-97 4th gen cat-back will fit on a thirdgen. However, the y-pipe design is different on 4th gens. 4th gen exhuasts combine after the trans. But thirdgen y-pipes have the driver side come down between the engine and trans to the pass. side.

To use a 4th gen cat-back on a thirdgen one will need a few feet from the thirdgen cat-back as the 4th gen I-Pipe is a bit short, and missing the slight bend towards the cat-converter.

I have a SLP 2otL from a 4th gen on my GTA. I had to have an exhaust shop bend a pipe to make it fit. Please ignore the dirty underside of my car, it had a RMS leak. I have have some rust to clean up.

This was from my Jury rigged setup to get it to the exhaust shop and have it fixed right. You can clearly see the bit of 3" semi-flex pipe I used between the cut-out and the I-Pipe. It looks MUCH better now and the exhaust is tucked up much higher.

 

did you happen to get the setup you where trying to do yet? im just going to get 3" pipes and change my muffler and cat to magnaflow. i don't want the whole 4th geen set up myself

 

I'm buying a 4th gen SLP cat back on thurs, just have to change the hangers on the exhaust

 

LT1 cat backs fit better than LS1 cat backs, but the LS1 cat back can fit too. I know, because I have one.

Previous owner had it installed at a shop, so I dunno what had to be done to make it fit. I do know though, that they charged him more to mod it to fit, than he he even paid for it. But I'm pretty sure they ripped him off too. I've heard it is different, but not to the extent to justify what they charged him.

 

Ive got a LS1 LM1 catback on my bird. The hangar locations change but fitment is the same. It makes sense because the 4th gen rear suspension/chassis design was taken directly from 3rd gens

Tip placement may need to change though