I'd like to try their direct drop in 12. 25'' full face feramic clutch. For $400 is seems like a heck of a deal if it can really hold 450 HP and 900 ft/lbs. No need for 13'' conversion for my needs if it's really all it's hacked up to be. I asked my bro about it (diesel mechanic) and he is very skeptical, he said something about you never know how well it's made and things like it could be really grabby or wear out really quick. I don't know, I think for $400 I'd give it a whirl rather than $1000 for a con FE 13'' conversion.