Well, for the gas smell its going to be somethin you cant really change.. no cats.. have you told mpt that your vehicle does not have cats or that it is possibly running rich? Did mpt supply you with a handheld tuner like an sct tuner which you can read data off your car? And white smoke is typically fuel left in the cylinder and blue smoke is oil, someone correct me on that. I get those two mixed up all the time. Hopefully someone else tunes in to this and posts something that will help more so!