u/CalligrapherMurky963

I have a 2026 BMW S1000RR with a slip-on exhaust, but it’s still not loud enough. I’m thinking about installing a decat mid-pipe and removing the catalytic converter, but I do not want to do an ECU flash or tune. Some people say a tune is mandatory, while others say it’s mostly necessary only for full exhaust systems.

Can I run a decat mid-pipe with a slip-on without a tune and let the bike adapt on its own? Will it cause any harm to the engine or should it run fine?

Also, my bike is still under warranty. If I install the decat system without tuning the ECU and something later goes wrong with the bike, will the dealer be able to tell that the exhaust was modified?