on a stock car there is nothing to tune. if you are going na to turbo you'd be better off finding a turbo ecu. you only really need to tune after you've modded the car, and im not talking just intake and exhaust. a tuning is needed if you do the lexus afm and 550's, upgrade turbo, etc.
you might get some extra ponies out of tuning the ecu out of a stock car, but i dont think 5 hidden hp is worth spending money to dyno and tune.
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88 N/A w/ 5spd - stock - not running, bhg
87 turbo/targa w/ 5spd- fidanza light weight flywheel, new oem slave cylinder, apexi air filter, no ac and no heat
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