I installed a Centerforce clutch about 3 months ago. First off, it IS a Valeo clutch assembly. They are simply modified by Centerforce with the attachment of their "patented" weight system. I personally can't see or feel much of a difference between the stock OEM clutch and the Centerforce. The only difference that is obvious is that they painted the pressure plate gold, slapped a Centerforce sticker over the Valeo logo and added the weights....There is no "clunk" when it engages, as a matter of fact, it is quite smooth, but then again so is the OEM clutch when properly adjusted. Your master cylinder leak is most likely responsible for the "clunk". When the time comes again, I don't think I would spend the extra money for the Centerforce. IMHO, any improvement attributed by the addition of the weights is at best negligible. Rustproof Vin 1559