[xcop]

Thanks for your help guys. After looking at the problem from a different angle, I think I will lower the opening instead of raising the pipe.
This all started with different pipes, trips to the dyno, weekends at Hallett raceway, different tires, the typical Cobra sickness.
I have since moved, so no more Hallett. I have proved to myself I can go fast, so I think I will just cruise the curvy roads, and enjoy the car at a more moderate pace.