Hi guys , I owned a E89 35is . I changed the exhaust and something weird happened. Whenever I press pedal too hard , the car starts to vibrate and the yellow engine light sign came out. The exhaust is just a normal exhaust , no brand. Please help guys . I would like to keep the exhaust cause its sound awesome 
. But I would change it back if I have to. U guys ever heard of this situation ? Please reply ASAP . TQ
. But I would change it back if I have to. U guys ever heard of this situation ? Please reply ASAP . TQ