350 BY-U Posted November 6, 2006 Share Posted November 6, 2006 My local Lexus dealer now has available the new HKS exhaust for the IS. It is veeeeerrrryyyy nice! I was told gains are between 12 and 18 HP. The service rep said it lowers the exhaust tone to sound more beefy and definitely frees up the breathing. The catalytic converter isn't touched so the dual exhaust is from the resonator back. I am concerned about the increase in cabin noise, so I'm not sure if the HP gain will be worth the increase in noise. I have the 350 so it's got plenty of pop already, but you can never have to much right? Any feed back about after market exhaust is welcome!!! :D Quote Link to comment Share on other sites More sharing options...
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