I would ditch the VE pump completly and do a p-7100 conversion. Alot more power can be had from a p-pump. A set of 5x.018 injectors from Smokem, Harts, Scheid, or Columbus diesel should work nicely. You will also want to go with an NV4500 5spd and a 4.63-5.13 gear. As for the turbo, anything is better than stock, but in the 2.6 class about a 65-66mm is the limit. Some 66mm's will not pass a 2.6 class. Also on the turbo I would not get an exhaust housing bigger than a 16cm. I would even try a 14cm housing first. IF you really wanna spend the money, you could always go with a big custom turbo from schied or Engineered diesel which would be probably a 2.8 or 3.0 charger with a custom front compressor cover to pass a 2.6 class. Also don't forget the added insurance things such as getting the head o-ringed, head studs, dual disk clutch, valve springs, 35 spline or larger axles, full billet spool. Or if your rules will allow it, just go with a 2 ton rearend such as a Rockwell F106, Traction bars, hitch, suspension blocks, ect......... YEAH, PULLING ISN"T CHEAP BY NO MEANS TO BE COMPETITVE!!!!