clifford performance makes them. I see them in California Mustang catalogue. $300. I bet they make the car sound better and it says 15% hp increase. If i had a sixbanger, i would get it. Pricey though. also says Ac compressor must be relocated, if you have AC
1966 C code coupe. T5, TCP front coil over, TCP Rear pushrod suspension, TCP subframe connectors, TCP power rack and pinion, 13" Baer 6p front and rear, Autopower Rollbar, almost track ready!