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I don't know how much the BigTom IC increases the power. In my case it is now possible to run 20 totally limp free PSI's and it was 18+ PSI before with a Helix-copy. Whatever the reason is, many factors comes into play, the power increase should be about 10% turbo power (that is 200 on a 400 hp level) , i.e. like 20 horses more with 20 PSI vs. 18 PSI. It is also not only about peak power, the new IC pulls noticeable better on high RPM's where important extra speed is built.
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