Originally Posted by XwChriswX

Yes there are nay sayers, but also those that have had them on, and on boosted cars and have had no problems as well.

Most problems can be attributed to improper installs.

I had my NST pulleys installed almost a month ago and have had zero problems and zero oil loss and I've been checking it every week for this exact purpose. I held on to my stock pulleys in the event of something going wrong, or if I decide to swap them back out for TT.