Ran my 17.5 Sonic tonight at WCRC for the first time onroad, and wow, very smooth and fast. I have used the Duo3, Ballistic, and Speed Passion and this motor definitely felt much smoother (I understand what people are saying) and it actually seemed a bit faster tonight compared to guys running Duo3, Ballistic, LRP and Thunder Power. I did increase the timing and gear it according to Rick's setup and I can say it is very impressive.