Why are you sorry? I know the OS 18 is borderline too much power. Besides the obvious fun of racing RC trucks, there is much fun to be had in trying new engines, upgrades, other crazy projects or attempts at new source's of power. I understand that the NX15 was the cheapest powerful engine, but, CEN claims this to be a very powerful motor. Big Block size, with a .15 displacement. A whopping 1.5hp at 33,000 rpm's. It sounds like a fun project to me. The CEN MT2 Fun Factor is one of the most fun trucks to run around with, that I have ever owned. Thats why we have 4 of them. Even though this NX15 project is on hold for a bit, I can still play tomorrow with another vehicle. Our motto, always have a spare, for those sunny days. UPS and FEDEX dont ship on Sundays, so why take a chance to be stuck without a running RC truck on such a beautiful day.