If you have a built engine, with strong components, the right tuning by a professional, and a turbo running 9 - 14psi, how many miles should you expect out of your engine with a few times to the track / autocross?

 

well if done right, i would think it would be as reliable as stock, maybe a few thousand less or so but pretty close
but bump for more info, as i would also like to know

 

It would last you as long as you take care of the car. If you change your oil on time and check all fluids, I would think it would last you a long time. It all depends on the owner.