I have a 2001 WR250F with a DRD exhaust and it won't pass the AMA sound check. 96 decibals at 5000 rpm's. It blows 102 and I just repacked it. I put a yoshimura insert in it and it still was at 100 decibals. The DNR in the stated allows for 96 at 3750 rpm's and it will pass that. What exhaust systems will pass the AMA sound check? I'm guessing a used stock one will.