Originally Posted by BRappaport
From what I have read on this forum and on the MB forum, The under-pulley kit made specifically for the MB SLK 320...our engine in the crossfire...adds 13 HP to the wheels...and that seems to be the best HP/Dollar performance for the CF.
This number sounds a tad high for pulley sets. 6 hp is more reasonable number and that still might be a little optimistic too.
I would buy a set myself if it were not for the $400 price tag.