RB 70mm 'Big Daddy' Exhaust ManifoldRB 70mm V Band (Big Daddy) Finally, we can show you one of our most complex designs. Like our RB High Response manifold (Reverse Rotation) this design will fit RB20 25 and 26. You can also use the same model to fit an RB30 bottom end, with its taller deck height. We used a @garrettmotion G45 1450 and a G40 900 for the development of this manifold along with a @turbosmarthq 50mm wastegate. If you want more flow you can simply cut and weld a 60mm