The guys at McLeod are top notch and built 2 awesome clutches for these cars. The RST is the best street clutch for the s197 cars, a little more pricey but well worth every penny. A little caution for the RST at the track is to take a good cool down break between passes and it will be fine. As far as power shifting with it , you will sometimes get a chirp but it shitfs great at any RPM.