I have one (CRRC Pro top end and modified CY bottom end) and I'm well pleased with it. It is not the most powerful engine money can buy but it is tractable and delivers the power/torque where you want it for racing a heavy largescale car. The engine was serviced late last year and dynoed again and is producing alittle more power than when first dynoed (see below). I have yet to have it dynoed with the ECU wired to it and/or with the Victory RC Pro pipe. The engine was dynoed without an air filter, FG Big Power on road pipe, Shell V-Power fuel and either Castrol XR77 or A747 oil.
Clive