my 04 redline has been in the shop a lot lately and ive been telling them i need the update becasue my car wont start like it should and i do get the bucking feeling sometimes at high rpms. They have been EXTREMELY stingy about this, they have been checking my car over (becasue the check engine soon light came on). They said i was "campaining for the upgrade". I want to know if they tell me they put the upgrade in, how will i know if they are lying to me or if they really did? After you get the upgrade is there a noticable diffrence, is there anyway to check the car?