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  1. Active exhaust valve not fully open?

    I reinstalled my GrimmSpeed exhaust valve simulators, but the flaps are not fully open. I turned the car on, put it in track mode then shut it off. Both sides were partially open, but not fully. Should they be fully open? I am thinking yes, but wanted to make sure. I sprayed some...
  2. Need 20" tires to handle ~800whp

    I recently got Signature wheels (20x11 and 20x11.5), and I love them, but I am trying to find a tire to handle around 800whp. Signature suggests 295/30/20 and 315/30/20. Other than Michelin Pilot Sport 4S tires, anything else that I should look at that has that size? I more concerned with...
  3. Clutch or tires spinning? Newly boosted newb

    Sorry for a stupid question as I haven't had a sports car or manual since the 90s. I got my GT350 back last night from getting a Whipple installed, and I took it for a drive this morning. Nothing crazy, just getting used to it. In the video, you can see the RPMs jump a little before I shift...





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