I have the Grip exhaust on my 370z. Only issues I have had are as follows:
1. Didn't lift the resonator section before bolting everything together so it beat on the brace below the exhaust. I loosened it and put a jack under it to lift it while I tightened everything down again. Most likely my mistake because once I did this the issue went away.
2. slightly uneven tips in the bumper. I've tried every way to fix it without bending anything but it is difficult to line up with just one person.
I highly enjoy the exhaust. It's got a great sound and little to no drone at cruising RPMs. Seems to be well built and has stood up to one season on the dragon already, plus the first day back this year. I will buy their exhaust for about anything I own.
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