I've had my Stillen underdrive pulley (which is even lighter and more underdriven than NST's) on the car now for about 20,000 miles over the course of 2.3 years or so. I'm in the upper end of the RPM range often. Zero issues. I don't even get what some consider "normal" VHR oil consumption. My dipstick level stays virtually at the same level throughout an oil change cycle for me (but then again, keep in mind I'm a fan of changing oil early and often. What I take out of my engine often looks good enough for some people to put right back in theirs). I also haven't had any strange engine symptoms or noises of any kind.
All of that said, there are at least two things to take to heart from Sam@GTM's pulley info in that other thread:
1) Clearly, he has a point about the Aluminum pulleys partially welding themselves onto the crankshaft over time. It makes basic sense, and his video removal evidence is pretty compelling. They can still be removed, but don't expect to get them off at a later date with just a simple home garage impact wrench with the engine and radiator still installed like normal. I'm sure mine is pretty well glued on at this point, but I also don't see myself ever removing it.
2) Underdriven pulleys will throw off the pulley ratios for a supercharger kit. You can correct for this by also changing the pulley size on your SC kit, but it's probably far simpler to just leave the stock pulley in place with SC (not to mention, if there's *any* shred of truth to engine life concerns, which I doubt at least in the NA case, they'd be more important with FI). You're adding so much power with FI anyways that any gains from a pulley are too trivial to care about.
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