Exhaust will be much better. Try taking the air filter out completely and you may pick up 5hp. I can feel the car being choked by the exhaust, but like all exhaust systems, they are only as good as the headers.
More Performance's CAI and tune sound like the best deal going so far. When the Corsa Exhaust comes out these three together would be a nice combo. Electric cut-outs would also be fun.
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