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Gains seen on the 5.7 TPI

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Old Sep 23, 2002 | 09:16 PM
  #1  
D Stroy H8's Avatar
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From: Las Vegas, NV
Car: 1990 Iroc-Z
Engine: L98
Transmission: 700R4
Gains seen on the 5.7 TPI

Take a 5.7TPI (later L98) thats all stock with nothing but K&N filters for the intake...
now put on a full blown exhaust system - headers back - a good one too... how much gain you think? I think the 5.7TPI would see at least 25 horses gained no?
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Old Sep 23, 2002 | 09:36 PM
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Brett Gutshall's Avatar
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From: Carlisle, PA
25 is probably a good estimate. A 305 TPI with stock manifolds and dual cats picked up 8hp from a 3 inch dynomax catback in GM high tech performace.
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Old Sep 23, 2002 | 09:36 PM
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Mark A Shields's Avatar
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Car: 99 Formula
Engine: LS1
Transmission: T56
Axle/Gears: 342
Sounds like a very good estimate to me, that's what I usually say when people ask. Maybe even 30hp at the crank though.
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Old Sep 24, 2002 | 08:39 AM
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MdFormula350's Avatar
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thats what i hope to see, but i have to buy the exhaust first
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