I went to a local muffler shop, and had them make me an exhaust. I immediately noticed an improvement in torque over the HKS exhaust. I don't think the Hi-Power exhaust was made to go on a car with a header, but I don't have anything against HKS. In fact, I bought a set of HKS Hipermax III coilovers. Traction is much improved. Ride went to heck in a handbasket. Yes, I adjusted the damping. It rides as well as it's going to, and will not pass the "girlfriend test".