so i recently ordered a new ecu for my 89 s5, after ordering i reaized the ecu that i ordered was a N350 with california emissions whatever, and mine is a N351 which is not california emissions. are there going to be any main differances when changing the ecu out? im worried it will have less power or not run proporly..

 

one person told me that i will just throw a check engine light but no issues with the motor at all. maybe i will just return it and pick up the 351

 

you shouldnt have a problem with it my car is not from cali yet i passed cali smog legal with a street ported motor