i'm about to replace my dual cats with hi flo cats, are they 2.5"??

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90 IROC 5.7l (L98)
ram air, K&N's, air foil,Flows

LIKE A ROC

 

Stock are 2.25".

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

should I replace them w/ 2.5" and if i do will it still be legal?
Thanks

 

or should i go with 3" cats assuming its legal...they seem to be pretty big, i dont want them dragging on the ground...basically is 2.5" enough for me, headers will go on at the same time these do, with 2.5" pipes to the cats

 

most headers come with 3" collectors...no reason to go down to 2.5" plus most catback systems are 3" too....i would go with 3" cats.

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 LTs, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo here...but not installed yet)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

"Just because I've done it, doesn't mean I knew what I was doing!" - Me

 

3" collectors, yes, but exhaust shop will not bend 3" pipe to the cats, siad 2.5" is best he can do... also after the cats, how would you join two 3" pipes into one 3" pipe?
thanks...I would rather go with 3" cats, just trying to figure out if its necessary considering the other restrictions (i.e. 2.5" pipe) and legal.
Thanks

 

Guys, we're talking dual cat setups here, right? You dont want two 3" y-pipes into a 3" intermediate pipe! Stock its two 2.25" pipes coming out of the exhaust manifolds into two 2.25" cats, and then they join together into one 2.75" intermediate pipe. If you want to upgrade the whole thing, go with a custom 2.5" y-pipe, two 2.5" cats, into a 3" intermediate pipe, like I did.

 

thank you kevin that is exactly what i needed to hear, this little project of mine is starting to become more annoying than its worth and i havent even started yet