I agree with most of the above, but the 15cv-rx is a short stroke engine, so it is made for HP not torque. Most .15 engines are square (bore=stroke) meaning you get the most hp and torque. Another engine to look at would be the HPI .12ss It has a new type of sleave, so it is cheeper than most .12 engines. With a pull start it is about 139.00 US. I have a Nova Rossi CX12P in my NMT and I like it a lot. Cost on it was 189.00 us.