http://www.supraforums.com/forum/sho.../topics/152334
Here's a stage of modifications that you can use to go about moding your car, should answer your question regarding horsepower figures, max useable psi, and more.
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1989 Toyota Supra Turbo w/ Targa Top
White Exterior-Blue Interior
3" Blitz Catback Exhaust System
BIC Divorced Downpipe, Straight Pipe
Megan Track Coilovers
Apexi BOV, Turbo Timer, and Intake
Lexus Projector Fogs
Bride Low Max Replica
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