I haven't driven my 325iS yet. So about me being a bad driver, you are mistaken. I'm sure the m20b25 engine will do well against any Cav but I just want to have more fun. Not looking at putting 10+ psi, just something moderate that will spin the wheels more and just overall have some more kick. Thats the only reason why I looked at this "ebay" kit. But I will adhear to the advice and just piece together a kit instead.