uprgrade what all you need to withstand the power you desire(better safe then sorry)..pistons, rods, etc and of course the simple things like c-clamps/t-bolt clamps because you'll need stronger clamps because of more boost coming in. The lifespan of your boosted motor all depends on how you drive it everyday and how often you change your fluids. If you do alot of slight boosts or major boosts every other day or EVERYDAY; change your oil before 3k and change your timing belt/chain and other internals that need changing before their scheduled replacement. The less you push booost, the less you'll lose.