A dual crown on an Enduro……
Depends on how big I guess….
The new STICKERS on the 2006 SX Trail frames say: Warranty not void for any SINGLE or DUAL crown fork that does not exceed 170mm of travel.
And the Enduro front end, as far as I can tell, or any answer I've gotten from California is the exact same forged head tube, formed top tube and hydroformed down tube as the SX Trail.
Putting an 8 inch (203mm) fork on the front end will kinda upset the geometry, way to much trail, causing the front end to drop when turning the handlebar. Too relaxed of a headtube geometry as well.
I have an Manitou Sherman Slider+ 170mm fork on my bike and I LOVE IT!!!! Recently Tyler Morland dropped of a RockShox DOMAIN 318 180mm fork for us to evaluate. Its on my Enduro right now. I've ridden it twice now. And while the fork does not feel exactly the same as the Manitou, it is not coming off my bike for a while!!!! Ride height remains the same, small bump performance will get better as it breaks in and I have yet to bottom it out.
All in all, Specialized doesnt mind a dual crown fork on this bike (170mm and under), it matches well with 150mm (2004-2006 ENDURO) or 170mm (ENDURO SX TRAIL), so go for it!
And all the 2007 ENDURO SL's will come with 150mm Dual Crown forks…….