BMW S1000RR Black Widow Exhaust

[@amosingh3324]

Did you have to do a flash tune etc

[@Wooldrog]

I want to know the same I have seen different answers from different places it seems like yes is the best answer but I'm still not sure

[@ghoulslayer__7746]

@@Wooldrog after some research, bmw does a closed system where it would keep reading the O2 sensors (lambda) and it would automatically adjust and add more fuel. I've seen everyone recommend a tune to fix other issues like the spotty idle, or if you're in the US, the flat spot in between 4-8k rpm @ 2nd or 3rd gear. Its about $700 for the stage 1 tune from BTMoto but I have heard it is worth every penny