I want to get a piece of 3" piping to put inside my cat converter when I gut it, but the largest out local hardware store has is 2.5", where can I get 3"? Also, what material should I get, aluminum or what? Also, before I put it in the cat, will I need to put it in the freezer to shrink it? Thanks!

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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)

7.5" 10 Bolt with 3.42s soon to come!

 

Look in the Yellow Pages for a performance exhaust shop. I know there's one down here on Colfax & Kipling that does 3" exhaust, they'd sell you a chunk for your purposes. What you should do, though, is measure the ID of your cat, and get a piece of pipe with that OD (might be 2-7/8"). The heat/freezer routine wouldn't help much with a 1/8" difference. Use steel (stainless if available), as the heat at the cat would probably be a bit high for aluminum (steel would be stronger for the insertion process as well).

Good luck on your sniffer test after your mod, however.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, WP 305 heads ported & polished, Hooker headers & y-pipe, hi-flow cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

 

Then there's people like me who go for over kill with a 4 inch pipe from the headers al the way back to a single muffler at the rear with no kitty in between

You have to see it to believe it


Rob

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1987 IROC-Z Auto (LB9)
Black/grey interior with the stance of a streetfighter

Mods
Custom exhaust. 4 Inch pipe from the headders all the way back to a single muffler at the rear. No Cat.

Future mods due in March:
K&Ns
RAM Air
Air foil
AFPR

Hoping to get a couple of tenths with that lot

 

i could not find that stuff ANYWHERE. i had to call Summit and order a 4 footer from them for like 15 bucks. it came in like 2 days, so i didnt have to wait forever for it.

-brian

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1991 Camaro RS - Ultra Blue Metallic, T-Tops
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GM 350 HO Crate Engine - Vortec Heads, Edelbrock Intake, Holley 670 CFM TB, Edelbrock Water Pump, March Pulleys, MSD 6AL, Blaster Coil, 8.5mm Super Conductors, Cap and Rotor, Rapidfires, Hypertech Fan Switch & Chip, SLP 1 3/4" Stainless Headers, 3" Cat Back, Flowmaster 40 Series
700R4 - 2,400 Stall Converter, Vette Servo, Shift Kit, B&M Super Cooler
GM 10 Bolt -coming soon Auburn Pro Series Differential, Richmond 3.73s
Brian's 1991 RS Central NY F-Body Association
Join the Third Generation F-Body TBI Web Ring
z28boy@twcny.rr.com IM name: Z28 Boy

 

Usually your muffler shop will have that kind of stuff. Thats where I got mine. I didn't put it thru the cat though.


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Eric Natzke
91 Firebird 305 TBI
"It Ain't Stock"
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html