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AA E46 M3 5.5psi Supercharger
Active Autowerke Stage I supercharger for E46 M3. I've also installed this into the sedan with only minor modifications to the kit with regards to fitment. AA is well respected in the BMW FI community and I agree. A Stage II 500hp upgrade is available which requires free flowing headers and an alchol/water injection kit.
Here's a link to the discussion on E46Fanatics:
http://forum.e46fanatics.com/showthread.php?t=208704&pp=80
Individual updates below:
2004-11-07 AA E46 M3 Supercharger
2005-04-21 Assembly SC Oil Tank + Pipes