When and why you need to reset ECU, My 97 Max SE 5 speed, doesn't seem to be quick enough, I recently have cattman SS Y pipe installed, but still I don't feel the power, what could be the reason, and I had my car serviced big time from NIssan Dealer few months back. Any suggestion any help help wuld be really appreciated.

 

The resetting of the ECU is very easy. I have been told both that after every mod you should do it, and I've also been told it doesnt' matter. Personally, since it's easy to do, why not? You also will not notice huge gains right away on your Y, but it's coming.