I've been running between 8.5 and 10.5lbs of boost for over two years. The majority of that time, I was running extremely lean. That said, the only significant problem I encountered was a leaky headgasket, which I replaced with a new OEM one for $20. Of course, my engine only has about 50k or so on it, I'm no longer running an FMU setup, and I don't recommend running lean EVER. The main thing is to make sure you're getting enough fuel at all times. It's better to run a bit rich and lose a little power than to run lean and risk blowing something up. As for wear and tear, run a fully synthetic 10w30 with OEM filters and change them every 3k and you'll be fine. If you're worried about synthetic oil on your higher mileage engine, you can run a conventional 10w30 and maybe change your oil more often. Also make sure you're running NGK copper plugs that are at least 1 step colder(7's). If you fill up with 87 now, it's time to step up to 91 or higher. Higher octane reduces your chance of detonating.