Yeah that dyno is from a Subaru, probably with a single scroll, super long up-pipe. That really hurts the ability to make high HP numbers- I would expect a 7163 running high boost with enough fuel to make over 500whp on an LNF. There are some Subarus running single scroll 7163s making over 500whp- check out the Jager Racing Time Attack car. It is a very well built (read:$$$$$) setup though. I would suggest a twin scroll manifold and the 0.8 A/R twin scroll "G" turbine housing for your build for best results, but a "ZFR" style single scroll TH on the stock exhaust manifold should still work okay.