Brilliantly well made piece of kit. Slightly more crisp a sound in normal mode without being noticeably louder. In sport or race the exhaust tone really helps bring the the sound of the little 3 pot to life. Lovely sporty, raspy tone with the M235 tune I run without ever being droney. Definitely an OEM+ sound without straying into obnoxiously loud territory. Am overall super pleased as it is exactly what I wanted from a system.