Im hoping once mine it mapped it should be around that bhp on my AGU, to save money I made the exhaust, TIP, and exhaust manifold and built it all myself but ive still spend thousands!
Once you start you want to do it properly so everything adds up. Ive used a MHI turbo cheap and seem to be much stronger than the IHI turbos. Dont hear many stories of MHI turbos blowing up unlike the IHI.
Get a Garrett if you can afford it but at around 1k, exhaust manifold(decent tubular) around 1K and a down pipe around £400 already talking loads of cash without any of the supporting mods needed!