Originally Posted by
German Muscle
after seeing the X-Dyno results on these even after modified its clear Sirio has fallen short like they do with almost all of their off road engines. Ill stick with the VSPEC.
????? I never do unterstand these comments were someone get's caught up in the dyno numbers. Last week my Extech powered XT8 was running along side a VSpec powered truggy and I would gain on the straight on him. The extech has a smooth strong low end depending on what pipe your running compared to the vspec that's spinning tires, but when he's pulling in to pit I'm still making laps.
In the last 2 years I've ran Go motors, Vspec's, MR Ninja's, Novarossi's and Extechs and by far the best motor has been the extech in terms of fuel economy and power.