Just installed a Catless DP on my 228i(N20) 2016. The car sounds loud at a cold start
20-30 seconds after, the sound is normal. I have the JB4 Stage 2 on map2 with 93 octane. Sometimes the car like stops accelerating and then keeps running. A friend with a 135i FBO told me that the JB4 has a "Boost Safety" if it passes the boost limit, the JB4 itself is going to do that. He told me to get the USB Data Cable and adjust the "Boost Safety" in a laptop or buying the JB4 Bluetooth kit and do it from my phone.