I wanted to pick up some jets today so went to Tsunami down the street from my shop,while there I spotted a pipe from a blata liquid cooled racer the engine is said to make over 12hp at 16,000 rpm! I asked if they had any other pipes simular to that and that I could buy cheap,The mechanic there tells the sales guy to take me down stairs and see and well I found something that I think will work well after a bit of hackin and welding!This thing has a 28mm id at the flange and the actual chamber length is almost 3' belly dia is 80mm with the same length,Thats the same as most performance 70cc scooters use!