K-10, No modifications would be required on the Retrotek throttle bodies. The only thing inside them are the throttle blades and the Bosch style fuel injectors. The injector discharge is below the throttle blades so any leakage around the throttle shafts would be air only. However you would need an ECU that is capable of handling boost applications. Most of the aftermarket units will do so with the proper MAP sensor. (2 bar or 3 bar) Also you will need a boost referenced fuel pressure regulator to overcome the additional pressure in the manifold. Ron
