General engine questions/issues that aren't specific to the other categories

Greddy Evo2 exhaust or HKS hi power exhaust?

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By frampo
#48089 i have a greddy evo2 exhaust on my car, not had any problems with it, and it sounds nice, but am considering changing to a HKS hi power exhaust. i like my exhaust to be quite loud.

i think my greddy evo2 is a 2.5" system, not sure on what the HKS is.