exhaust diameter

[Drew99GT]

Can someone give me a clear awnser as to the stock exhaust diemeter for a GT and SE, both with v6es of course? 2 inch or 2.25 inch? Thanks

[ash]

I believe it's 2.25 (don't quote me on this). Everyone will argue about the size regardless.
-Mike

[StarFire]

you are right, it's 2.25.

When the magnaflows got installed....the 2.25 was the exact size of what was on there.

[mshu7]

Here are two more questions regarding the diameter of the exhaust. I know both questions were discussed frequently in the old forum, but we might as well post it up again just so we have it "documented".

What diameter do the Borla & SLP cat-backs come with?

Also, would there be any performance gain going from the stock 2.25" to say 2.5" or possibly 2.75"/3.00"?

[ash]

Originally posted by mshu7

What diameter do the Borla & SLP cat-backs come with?

Also, would there be any performance gain going from the stock 2.25" to say 2.5" or possibly 2.75"/3.00"?

SLP might be 2.5, again, don't quote me. And there is no gain by going to 2.5 unless you're running a worked engine. Turbos or supers might need a slightly larger exhaust, like 2.5 or 2.75 for an extreme case but then again we're not a V8. 3" is way too big. Remember, the limits on any exhaust system is the tightest restriction in it, so if you're gonna get a huge exhaust you're gonna need a high flow cat too.
-Mike

[StarFire]

...and you are going to kill your low end with a 2.5"+ exhaust. Our engines just aren't quite big enough. :)