mods
93 ls
gen 4-2-1 header(2inch flange)
colt cams(between 403s, 404's)
greddy mx
aem cai/ebay shortram

will 2.5 be too big?

 

.......

 

i haven't even installed my 404's as of yet and i have been runnin 2.5" all the way back with 4-1 longtubes, 2.5 collector
works well with ma skunk2 intake manifold which is obviously geared more towards high rpm hp
also i have 84mm bore so i actually am tryin to get more air out
the only bottlenecks i have are the stock tb(i need 64-65mm) and my stock cat flange was stuck in the front of my 2.5 magnaflow cat, but i found the 2.5 inch donuts and flanges at inline four.com
but i would go ahead and do it if u can get mandrel bends
i have crush bent, but aside from the weight it still outflows my lil soda straw stock exhaust

 

is you're going 2.5 then i would suggest you go with everything 2.5 ( headers, cat, cat-back) it would be good for later on if you plan on doing a lot of internal work. but i'm not sure if 2.5 is a good choice for now seeing that you haven't done much to your engine yet. but if you plan on doing more to it then yes it would be good.

 

i want a 2.25 one
but found one forsale for 20$
catco 2.5
thats y i was wondering .....

 

2.5 inch will be a good idea especially with a high compression motor.