I'm a noob to the forum but I have done a search and read what there was but really no specific answer related to my 2001 sprint st. I just recently purchased the 01 and must say I was quite pleased. Very nice bike.... However it still has the stock can and it is extremely quiet. Quiet is ok unless you live in the burbs like I do and every housewife, teenager is usually talking on their damn cell phone and cannot hear you when you are riding/passing along side of them. So I purchased the twobros ti m5 for the bike. My question is will I need to have the ecu remapped? I've read yes and no. It's a slip on can and mid pipe. That is all that is being replaced. Any specific info would be of great help. If I need to spend the $$ at the shop having my ecu remapped I will but if it is really not necessary I save the money for a 6r of Guiness and a couple of steaks.