85 305 tpi manifold vs 87 lg4 manifold
11-12-2000, 06:42 PM
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Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
The TPI will be marginally better, having a 2 1/4" outlet vs the LG4's 2" outlet...maybe a 5 hp improvement; also, each one requires a different y-pipe.
Pete
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