i was thinking of adding a bmpd or bavarian autosport chip to my 325ic cabrio. what would i gain besides the advertised h.p. and torque.my maine concern will be idel will this effect my idel . i have spent a lot of money to get my car running well and i dont want to fuck it up by adding some chip that will only give me a bit more power and torque so if any of you have done this please give me your opinion as how to go abot this