We have the same engine, but my cartuning kit is quite different. I have an air to water intercooler and I don't have an exhaust cutout. I only run a low restriction catylitic converter with no muffler. I'm sure that I stress the tranny more too. Being mid engine I get weight transfer and I have wide 20" tires. My tires do not spin. My mechanic was driving it when the stock input shaft broke and he was doing about 100mph so I'm pretty sure that the tc was locked. When I broke the 300m shaft I was accelerating on a freeway on ramp using tap shift and the tc shouldn't have been locked.