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First, isis sells crap, so forget them.
For reliable and somewhat cheap 300whp: FMIC, bigger radiator, nistune, ev14 based injectors, UP THAT BOOST, why stop at 15psi ?
There you go, now you can think about getting a stronger gearbox because you near its limits. Z33 box is very good.
Last thing : more power on the same engine = more costs, now and in the long run, and less reliability. Whatever you hear, never forget that.
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