No option there. It has to be a wastegate. You can't run a 6 cm turbine housing without it. There are 3 turbos in that family. The basic model that came on the P pump 4bt has a 40 mm inducer. The next step up is the 44 mm inducer. That's probably the best one if you think about twins. The big daddy is the Super HX30W with the 46 mm inducer. That's probably the biggest single you can use on a 4bt without issues. They boost extremely fast and can go into the 30 psi + boost range. Another option is the HE221W. That one boost lightning fast and also has a good reputation. Takes some adapting to use it but those who own one swear by it. The HX30W's would be a direct bolt on. The exhaust housing is about an inch longer than your H1C so you may or may not have to adjust there.