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if you want an exhaust for performance I wouldnt lean towards the HKS, dont get me wrong they sound great but they dont make any power. I'd get the GT-R exhaust plus its unique! Good luck on your decision
^ Yeah that was the first exhaust I had was the HKS, then I moved to the Nismo in which I actually gained around 10hp. Now I'm waiting for my new Greddy Ti-C to come in, Z1 said that I should even get more gains from that one!!!
I heard that the most performance-oriented exhaust would be Motordyne. So does someone have the actual dyno numbers for the HKS exhaust? Still trying to figure out what exhaust to get...