I have a 98 Acura Integra GSR. Right now the car is making a popping noise and not allowing me to shift past about 6000 rpms (it varies sometimes). The car is fine for daily driving, but I cannot do my best runs at the track because of this. I have a MSD ignition box (w/o rev limiter), MSD coil, NGK plug wires and plugs, and MSD distributor cap. I think that the problem may be with the MSD box. Some people have told me that they regularly have failures.