'03+ has the 5.4L motor which features a Lysholm supercharger. It increases output (from 354 horsepower and 391 pounds-feet) to 493 horsepower and 516 pounds-feet.

The supercharged cars are at least $45K,

Here's one for $39.5K on eBay
http://cgi.ebay.com/ebaymotors/2003-S55-AMG-53k-miles-Light-Gray-Interior-Keyless-GO_W0QQitemZ260115981519QQihZ016QQcategoryZ6336QQrdZ1QQcmdZViewItem

The seller purchased it from Luxury Motors in Chicago. Their cars rarely come with any service history. Buyer beware.

__________________
'07 Yukon 2500
'13 Subaru Outback 3.6R
'13 Orbea Carpe 9-speed

Currently Benzless
Formerly: 300TD, S600, E55, 560SEL

---= The forest breathes, listen.
-Native American elder