6Boost Exhaust Manifold, for Nissan RB26/30DET (DOHC), GT4/50 'Divided Entry' Single 50mm Wastegate Port "GT42/GT45/G42/G45/PT Sportsman Add a titanium stud kit:No They are manufactured from 1

They are manufactured from 1 5/8 in

Rated for 500hp

and Dart has identified a significant void in the legendary inline-six performance platform’s needs

determining a fuel's resistance to knocking or pre-ignition inside an engine

6Boost Exhaust Manifold, for Nissan RB26/30DET (DOHC), GT4/50 'Divided Entry' Single 50mm Wastegate Port "GT42/GT45/G42/G45/PT Sportsman Add a titanium stud kit:No They are manufactured from 16Boost Exhaust Manifold, for Nissan RB26 30DET (DOHC), GT4 50 'Divided Entry' Single 50mm Wastegate Port "GT42 GT45 G42 G45 PT Sportsman" Prepare to unlock the full potential of your turbocharged engine with a 6Boost turbo manifold. All 6Boost manifolds are specifically designed for your application and built around a unique "merge collector" design. This means no pipes cross each other and the merge collector directs all exhaust gases at the turbine