wheel hop. I had been experiencing significant wheel hop on the steet and at the strip, and had Greg install his new subframe mod (it compresses the 4 bushings that support the subframe arms (not sure of proper terminology). I then made some launches and rolling runs with 24 lbs of boost and experienced no wheel hop, only some loss of traction, but the tires spun, they didn't jump up and down. He showed me the difference in the amount of travel with the mod installed and with the standard set up...the difference is night and day; from almost no movement of the subframe assembly to about an inch of travel with a load applied to the stock set up. The ride quality is a bit firmer but still comfortable and near stock feeling on the touring setting. Nice product Greg! Mark