My math.....with a conservative goal of 650 whp.....and 800whp capability.....says that the Turbocharger System needs a minimum of a 70mm compressor inducer, and .96 AR exhaust housing with a 75-80mm turbine exducer.
2.5" crossover piping......T4 Flange..... 50mm wastegate...3.5"exhaust after the turbo
and the appropriate amount of fuel at the proper fuel pressure.
$$$
3
Like the description of "money" to the 3rd power......but no doubt it will make HP
2*
Hp Squared.