I installed mine in my B4.2. This is what I'll report. On the car stand with the power on, the Xpert is slightly louder (using radio to turn) than what I had in the vehicle (Spektrum S6040), what I have in my Tekno SCT410 (ProTek 130SS), or what I have in my T4.1 (JR9100S). However, it's blazingly fast. Definitely faster than the Spektrum, not quite as fast as the ProTek, very comparable to the JR which is saying a lot. Can't wait to get it on the track and see how it stacks up then. Bench testing score : A.