I did mine back in '03. There was no OEM manifold so I designed and made my own. Cost was basically the VForce and my time, plus some Tig welders time. For you its easy, valve, maniflod, and a little elbow grease. The bike gained low to mid. I had the VForceII at the time with the adjustable reed tension, set to low. That '03 bike was a dog off the bottom and this really helped a lot along with a CDI from my '00 XC250. I suspect the VF3 will help more in the midrange as the fixed reed tension is stiffer. '01 250 should have no low end issues though, '03 had a different CDI with a crap map.