1. Carbon fiber driveshaft. Ultimate response.
2. The biggest, nicely merged custom exhaust you can fit.
3. Oh, and don't change the head gasket thickness. It's pointless.
4. I've also heard Apex'i are the best headgaskets you can buy.
5. Forget the injectors and rail, as the intake and exhaust alone with good tuning should net you around 350hp.
6. Power Enterprise strengthened belts
What are you running for engine management?
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