Pictures of my finished bike, Since you already have a Video of it running 
btw here's the vid
http://www.youtube.com/watch?v=rIoziF-4z9o&feature=BFa&list=FL9WIjS6lbLUJQi3qT3Kn_sw&lf=mh_lolz

btw here's the vid
http://www.youtube.com/watch?v=rIoziF-4z9o&feature=BFa&list=FL9WIjS6lbLUJQi3qT3Kn_sw&lf=mh_lolz
........... She sexy




and yeah the big inserts on sparky's are all the same size, but the size of the silencer they fit on changes. Mine is only 2 and a quarter inches and the sparky is like 3.5" or 4". I also take the sparky off when I go to the MX track, because it isn't needed.
Haven't talked to Jeff in awhile, wonder if he came up with a new track layout yet.