high comp is no problem with that overbore - turbos put more strain on the internals, even though you're running lower static compression than NA - it's the dynamic compression that counts. The only thing that's gonna wreck a sleeve with NA is detonation. You will get much better throttle response and more torque/power with 11:1 comp... you'll have to run premium gas all the time! The last D16 we built had about 11.2:1 on a 1mm overbore - it put a big smile on our faces when we first drove it! Just be sure to use a stock headgasket, they are so much better quality than the cheaper Fel-blow line that Autozone carries - I had many problems with these even on NA D16s.