Quote:
Originally Posted by Redlineviper
The more HP or air your engine expels the bigger the gains. For most the npp is sufficiant. I am installing my corsa in a couple weeks and expect 20hp gains and I am making 850whp. I think a 640-700 hp cat might pick up 5-10. That's just a guess. More of a gain in reducing drone than hp sometimes.
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I think we should qualify that both of our cars are Twin Turbo and they are MUCH more sensitive to restrictions after the turbos than these PD cars.