I have a 91 Camaro RS with a 500+ HP 383 from my race car. Since the racecar is getting a new higher HP motor, I figured The RS would be fun with the 383. What exhaust would really be needed. I was thinking I could get away with a single "Mufflex" 4 inch system. I would love duals, but since this will be a toy car, I did not want to drop a ton of $$$$ in it.

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

 

Here is a HP/exhaust size chart use by Hooker and Dynomax.

HP------single----dual
200-300---3"------2.25"
300-400--3.5"-----2.5"
375-400---4"-------3"
450-550--4.5"-----3.5"
550-650---5"------3.5"
650-800------------4"
800-1000----------4.5"
1000+--------------5"

Hope that helps.
Why do most people with hot engines chock them with a single 3"????????
We'll never know, ignorance on the subject, I'd guess.

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91 B4C 305 TPI - SOON TO BE 383
TREMEC 5-SP, STOCK 1-BOLT REAREAND w/342 GEARS, K&N, AIRFOIL
EDELBROCK HEADERS, DUAL CAT TO HOMEMADE Y-PIPE & 3.5" SINGLE PIPE W/ FLOWMASTER, CRANK PULLEY, MSD, FUEL PRESS REG, COWL HOOD, WELD WHEELS
14.1@ 98MPH
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OTHER RIDE
67 CAMARO - STREET CAR, BIG BLOCK, PUMP GAS
350TH w/ATI 10", 12-BOLT w/373 GEARS
10.94@124.13 ON MOTOR - ET-STREETs w/MUFFLERS

[This message has been edited by RW91B4C (edited August 09, 2001).]