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The yellow GT is a Heffner Twin Turbo... 1k HP The great thing abt this is that the boost is controlled so that u have max boost only in 5th and 6th gear. It goes like 500hp in 1st, 600 in 2nd, 700 in 3rd and so on.
The advantage of a turbo over a SC is, beside efficiency, the flexibility.
These days you can swap the SC and mount a 3.4L Whipple for 800hp and 5-7k.
I still think the most effective is the smaller pulley that brings PSI to 17 (from 12 stock), remap and 750 hp.
The car stock is rated at 550... but most people get 525-540 at the wheels.
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