You are right Lantana... A sprint booster for the v8 might not be a good thing. I don't have the selectable version and honestly I didnt really notice a difference with the stock engine. But with the V8 installed it is not an easy car to drive. Paul drove my car from WI to MI so he had the oppertunity to compare his car without a sprint booster to mine with one installed (he didnt know I had it in there) and there is a world of difference. I don't think he like it... haha. I have not had the seat time to get the feel for the car yet to test it out due to snow.