If you are comparing HKS & FI, then you better go with FI. You have to remember that you have to pay to play. Nothing is cheap about modding a car, not unless you do everything yourself which saves you labor time.
I would put the money into the exhaust to get the sound that I really want regardless of the price. To be quite honest with you if you want a bada** exhaust system & you are going to replace all three sections of the exhaust you will spend b/w 1.5-3k. Please do not be cheap on the exhaust b/c down the road you will regret it.
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