I plan on putting true dual exhaust on my 82 camaro when i finish rebuilding the 350. i will have some good headers, and i want to know what size pipe i should run to my turbo mufflers. is 3" too big, i see people on here always talking about it, but from what i have heard, it is oversized for a 300 hp 350. thanks

 

No, not at all, my car has 3" exhaust from the collectors of the headers all the way back. 3" is the perfect size for any engine making between 200-350 horsepower! My friend has a 3" cat-back system on his 85 Z28 with a 305, he's only making about 170hp and and that 3" exhaust is no where near too big!

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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

 

3" is to big for a dual set-up. Yuo should use 2 1/4" to 2 1/2" to run duals. There easyer to run as well.

Steve