450-500 is doable on a stock F20C. It has forged pistons, an amazing head, and the same Honda crank as they all do. With your engine setup, it should be able to reliably do 200HP per cylinder without too much head work.
5000 for a sleeved block, forged pistons, forged rods, a 2.2 crank, and a turbo kit along with ems and all gauges, and injectors is damn good for 5000 if I dont say so myself
I'd like to know where I can get a standalone, gt35r, sleeves installed, line bore, cylinder bore, hone, cleaning, pistons, crazy expensive rods, intercooler, oil lines, charge pipes, blow off valve, wastegate, exhaust manifold, downpipe, injectors, clutch...
I'm sure I missed some things that come in a 'turbo kit' but whatever, the point is I wish I knew where to get parts for that kind of cash.
Some parts were used, like the intercooler and the EMS.
S2000 owners buy shit at high retail and I end up buying it slightly used for cheap from them. I own a shop, so the charge pipes, downpipe and anything that needs fabricating I can do for cheap.