Look at Kleeman.
Me, I am polarized toward blowers, but I do have a turbo'd SL. Blowers make for a clean installation.
Just my two cents.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport