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May 11, 2002 | 08:48 PM

IROCBOY

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Joined: Feb 2002

Posts: 209

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From: Java NY

Power

How much of a difference in power will an American thunder cat-back and Hooker headers have on my stock 305 TPI?

May 11, 2002 | 09:29 PM

IROCZTWENTYGR8

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From: In a mint Third Gen!

Car: Red 87 IROC-Z28 T-Top

Engine: 5.7 Tuned Port Injection

Transmission: 700R4 Auto

Axle/Gears: BW 9-Bolt 3.27

You'll see a nice noticable increase. Probably around 15-20 HP.

May 11, 2002 | 10:32 PM

Mark A Shields

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Joined: Jan 2001

Posts: 7,164

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From: Someone owes me 10,000 posts

Car: 99 Formula

Engine: LS1

Transmission: T56

Axle/Gears: 342

I'd say with both around 25-30hp.

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