Hey all, I just got my first third gen yesterday. When I looked underneath at the exhaust system I was so amazed at the poor design of the thing. Right angles, really long cat, and small pipes!!! What do I need to change first to make the most difference?

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90 Firebird LO3

 

You need an aftermarket cat-back system. Most of these systems feature 3" tubing, mandrel bends and a high flow muffler. Most can be purchased for less than $300. Below are some sites where you can look at and purchase exhaust systems. Good Luck!

www.summitracing.com
www.jegs.com
www.edelbrock.com
www.borla.com
www.randomtechnology.com



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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!