Hello guys I have run the Jp r9s, and max xl9 tq. I have seen plenty of cl7r sti engine and it is just as fast as the novarossi motors if not faster. I want to run the cl7r Sti motor this year but I was told they are a one race motor only and that they don't last long. I also am interested in the cl7r abc version of the cl7r sti (aac version) but can't find it team epic don't carry the cl7r only the cl7r sti. How long will the sirio cl7r sti last if it is taken care of and not overheated? The sirio motor is cheaper but if you have to rebuilt it after every race the motor is so cheap anymore so you might as well pay $650.00 up front for a good nova, or max power engine than to pay $360.00 for a sirio cl7r sti and $220.00 every gallon for a new piston and sleeve. Some one please enlighten me.