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Usually I would give a smart A$$ answer and say in Church. However, since your not in the states I will cut you a break. They are a bunch of thread on this topic going on right now. Exotic Muscle, Stainless works, TPIS, Hooker all have their fans on this board. Do a search and read the drama that these threads start. Then pick the headers that fit your wallet, your performance goals and your C4.
When your asking for performance advise you should provide some info I:E:
Year,
engine type: LT1, L98, or LT5
transmission type: A4 or manual?
Exotic Muscle's will work on an automatic with the bullitt cats behind the transmission. Will bolt up to a Corsa or B&B exhaust. Give Merle a call at 480-967-4222.