I just finished installing an Alta 15% pulley. I followed the excellent instructions from mini-madness ( http://www.mini-madness.com/pdf_file...EY_INSTALL.pdf ).

Here's what I learned:

Helpful Tools:
1) Ratcheting wrenches: http://www.sears.com/shc/s/p_10153_1...No=1&blockType=
2) Universal joints (1/4 and 3/8)

Installation tips:
1) Remove the passenger side wheel and fender liner. This is easy to do and will allow access for replacing the belt.
2) If using the alta pulley removal tool, the belt tensioner must be removed. This adds some time to the overall install compared to mini-madness tool. The tensioner has 4 bolts, 2 of which can be removed from the top, and 2 from the passenger side wheel well (see #1).
3) While you're in there, add a belt tensioner stop. I got mine from Alta.
4) Buy the right belt! For a stock crank pulley with a 15% supercharger pulley, the NAPA 060535 works very well.
5) When installing the belt, the last pulley to wrap around is the one shown in the diagram below. That will allow the most clearance on the belt since there are no "teeth/grooves".

The install took me much longer than I want to disclose but the performance gain was well worth it! The car is one step closer to being a real "S".

If anyone in the bay area needs help with this, lmk.