i just recieved my TES headers today, they're getting installed next weekend. Now all i need is the cat. I already have a Edel. RPM cat-back, but unfortunately it has the 2.5" reducer on it to match the stock LG4 CAT. I know i could have the reducer chopped off and replaced with 3" pipe, but it's gonna be more expensive to do that. Im kinda hoping someone makes a good high flow CAT with a 3" inlet and a 2.5" outlet, and keep it cheap too. Like no more than 100 shipped. Right now im looking at catco and Dynomax, but i don't see that size. Suggestions anyone?

PS- i am NOT putting a straight pipe in place of the cat...

-I'll probably end up having the reducer hacked off so i can have a full 3" exhuast, but i thought i would at weigh check my options first. Either way i need a new cat...

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My 1986 Z28 and more!!
85 IROC w/ 1364 miles!

R.I.P Dale Earnhardt

 

You can check at Catco performance, that should be pretty inexpensive. But, it is going to be hard to find a 3"/2.5" catalytic converter and you might just want to save yourself the hassle and have the reducer cut off and a 3" piece added, I think that is what we are going to do on a car that belongs to a friend of mine.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

yeah thats about what i figured, i just thought i'd end up doing. I just i would check first...

 

Just get the reducer cut off, and a extra piece of 3" pipe up to the cat. Catco will have a 3" in/out cat w/ slip fit on both sides for under $99. The factory replacement 3 incher Catco (w/ bolt up flange on the out side) runs $99 from Summit. Works great w/ my TES headers and Hooker cat-back w/ no cutting/fabbing. I'm not sure if they even sell a 3" in, 2.5 out cat. There wouldn't be much "high flow" about like that anyway...

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

 

Check my sig for stuff...even if you did find the right cat for the conversion, it would be a complete bottleneck for exhaust flow and good sound. I'm really pleased with my exhaust sound...reply if you want detail. However, that sound is with all 3". It gives the sound a deeper tone. Do yourself a favor and just get the 3" pipe with the Catco 3" universal cat. You won't be disappointed.

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'89 RS LO3- 140,000 miles
14x3 K&N Open Element
Ram Heavy Duty clutch
Edelbrock TES (Jet-hot coated)
Catco cat
Edelbrock 3" Cat-back
Pioneer DEH-P77
Dual .50 caliber machine guns just under ground effects

Coming:
KYB shocks
Edelbrock Strut Tower Brace
South Side Machine subframe connectors

When your buddy reaches for a 10-pound sledge and says "I think we're gonna have to modify the floor pan, okay?" the answer is NO.

 

sounds like thats what i'll be doing. i was trying to continue my never ending quest to be cheap. Owell, i guess it'll probably be cheaper to just buy the univeral 3" in/out anyway...

thanks for all your help