I have a CBR600RR 2015 that came with a Yoshimura RS5 with a power commander. It ran great and the bike had no problems. I decided to buy a new two brothers slip on with mid pipe and now I am having issues. I’m no bike expert but I didn’t unplug anything when installing. When I rode it, the bike throttle power cut out three times in above half RPMs and above. The low oil pressure light comes on when it happens too. Today, the bike wouldn’t even start, just cranks but won’t turn over. The bike was used at 4,800 miles, not sure what the previous owner may have done since I bought it from a private reseller. Any advice? Being told the tune needs to be changed to two brothers.

 

yo that seems kinda extreme just for changing mufflers, for sure mapping can help it run right but ive never seen changing a slip on cause a bike to not start at all?? I dont own a 600rr so I may be wrong but. Are you sure its the muffler, if you put on the old one back does the problem go away? I would try and put the old one back and see, that would also help you check if you accidentally missed anything. also is the muffler new?