Let me get this streight, are you asking which sled would be better to mod? Depends on what your looking for I guess. I would think the pro x would be the better choice for alot of reasons. Also if the pro x is a six I would go with twin pipes and a ATACC system for fuel management.
Life's Short Ride Hard!
Sled: 2006 Trail RMK 700
SLP Y-Pipe, Single Pipe, Silencer
SLP Velocity Stack
V-Force 3 Reeds
SLP Flow Rites (2.5")
5 3/4" Riser
Clutching:Primary Grn/Blk 10-62, Secondary Red/Blk 62-40-42/62-44-42 helix