I don't think he is questioning the ability of the engine/tranny to hold up to the additional HP/Torque that the Stage II will make, I think he's talking about also upgrading the brakes and suspension as well, which isn't a bad idea when you start adding gobs of go fast stuff.You need to be able to stop it and turn it quicker too.Of course, if you'll only be doing drag racing, then just make sure you have lots of shut-down area and you'll be OK.
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TripleJack