I was going to buy a high flow cat when I put my 3" Hooker aero chamber on, but I am getting gears installed and going to college. So money is tight. I want to put a cat on so I can pass emissions or at least get a waiver. I was thinking what are the chances I can find a cat at a junkyard that will fit my exhaust with Edelbrock TES headers. What size in/out do I need. Also how do I hollow out the cat so it won't hurt my air flow since most likely a junkyard will have stock ones.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage, and just replaced a burnt plug wire
"There is nothing more addicting than speed"

 

I don't know about the junkyards where you are, but out here in SoCal they won't sell used cats. At least not at the PAP's.

 

It is against federal law to sell a cat off of a junked vehicle. Most yards won't do it.

What will fit your TES depends upon which TES you got.

Hollowing out the cat is contrary to your goal of passing emissions.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet (Holley 3310 on the way), GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

I believe that it is actually not permitted by federal law to install a used cat on your car, and also to sell them. EPA thing.

 

Yeah, my 3" Catco cost me about $50 bucks from summit. Maybe just spring for that.

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No guts, no glory.

 

Guess I will go with the Catco, that's what I was planning on anyways. Oh, the reason I was going to get a junkyard one and hollow it out is because, here in MD if you don't pass emissions, but spend a certain amount of money on repairs with receipts, then I could get a waiver.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage, and just replaced a burnt plug wire
"There is nothing more addicting than speed"