But if you wish to add much more and arrive at 400 HP, you have to change your OEM turbochargers Along with the GTR RB26DETT N1 turbochargers, acquire a large intercooler and an MLS gasket head.8 in) to improve air velocity and very low end torque) in particular the RB25DE NEO which experienced two inlets heading into your inlet manifold. The comb