701 sits further forward in my hull. X2 fuel tank is T I G H T already, I'll be running a small 2-3 gallon kart tank this season. Also, my mod chamber only has a few inches to make the 90 degree bend needed to catch the water box. My waterbox has the mounts all cut off, and is resting on turf so I can roll the top input tube as far forward as possible. Just keep this in mind if going with the limited, it's the reason I bought a mod. I don't know from experience, but I doubt your going to see THAT much difference from limited to mod. Maybe going from SJ mod to blaster limited or something.. Again just opinions, I really don't know. When putting together a puzzle like a 701 X2, the more room the better.