550 is easy at 1.5 bar - I made 500 at the wheels with a crap conservative map at that boost. With 1.6 and a good track map you'll be closer to 600 at the crank.
I need to start shopping for spare turbos. I estimate about 5000km life left in mine. 20,000km between rebuilds on turbos may seem ridiculous, but then you haven't felt what 2 bars on these are like!!
