Valair ZF6 Spring Hub Street Dual Disc Replacement Clutch with Solid Flywheel 01-06 6.6L GM Duramax 650HP
The Valair Spring Hub Dual Disc is available in several "styles." First, you can opt for a Ceramic / Ceramic facing. The ceramic facing is good for those that are a little more abusive to their clutch, and may find themselves doing a boosted launch occasionally, but are not towing everyday. This clutch is still a good towing clutch for those headed out with the travel trailer on the weekends, but will be too aggressive if you're towing everyday. Next, you can opt for a full organic dual disc. This clutch has by far the best street / towing manners of any ZF6 dual disc and still has plenty of holding power, but will NOT take up to boosted launches due to its organic facings.
Put it this way, if you merely tow heavy with a modified truck, go with the organic. If you're towing, but going to the track on the weekends, go with the ceramic.