I have the stock 121”. I already have exhaust and air filter upgrade installed and obtained the 569 cams and an ECU from G56 which I have yet to install. Does anyone know if putting in a 58mm throttle body will help at all with this setup and if so by how much does it improve things? I’m guessing since KH and G56 don’t include the 58mm in their kits then no? I did read here though that Morgan included the 58mm in their stage 2.
