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      08-29-2011, 09:51 PM   #23
HP Autosport
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Drives: F80 M3
Join Date: Mar 2007
Location: Santa Barbara, Brembo, GIAC, Koni, Ohlins, Performance Friction, Quaife, Stoptech, Vorshlag

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Quote:
Originally Posted by STALKER View Post
I thought AST did not make 4100s for the E9X M3?
It's a custom kit by HP Autowerks, Inc. to fill the void between just lowering springs and the high end AST 4200 or 5000 series.

It is really not that much different than the 4200 except the lack of compression adjustment and none aluminum rear dampers.