I can tell you why you should.. I have one on a 363 also , pro x not a cpi though. I have rode mine about 6 times now the latest a couple of weeks ago with rblack from the other forum. I know people are probably tired of hearing about it but I love mine. I got the 40mm and it has worked every bit as good as apt claims it would. So far every ride it has ran perfect, not a single bog or miss and this last ride we rode mx. It was probably high 80's or low 90's. Before when it got that hot I was changing needles and jets.