Hack ‘n’ weld BiTurbo on the Iowa Urban Express.
After adding an SHA carb and getting the right jet in, this thing hauled ass! It also helped that I raised the exhaust port slightly – maybe a couple millimeters and opened up the exhaust port in general. I later added a monster air box which slowed me down but I may switch back. The biturbo is relatively quiet which is great. I got lucky with the header length as well. There’s a formula on youtube that I’ll link to later.