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I can't quite remember but I think someone on the boards may have mentioned the corsa gets stupidly loud with a uncatted uel header. But 'stupidly loud' is fairly subjective depending on person to person. I think a Magnaflow should be more tolerable with your set up. Not sure about xforce...
I also suggest looking at the Q300 or you can even save some money and go back to stock catback. The power gains with an aftermarket catback is pretty minimal anyways. Both will substatially reduce the amount of noise than your current setup but still will be loud enough for people to turn heads when you rip by!
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