Just bought a HKS hi-power exhaust for my EM1?
why would you lose power on a aftermarket exhaust? i think that you should do some research before you ask another stupid question and also dont ask after you buy it.

Exhausts dont make HP, they free up power your engine already has.
*edit: over priced name brand exhausts are super trendy, I wouldve gotten a tubing kit, bought a res/muffler and do it yourself.. save 200 bucks and that way you dont have a raspy grapefruit shooter hanging out back.
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