R6 shock mod or Nitron sport

[PieEater]

IMHO I think you'd need to be looking at the Nitron Track shock before ruling out the R6 shock. The Basic Nitron Sport shock lacks features of the OEM Fazer shock like independent adjustment for compression & rebound damping and a remote reservoir. The R6 shock gives you these so is going to be more of a like for like upgrade, the Nitron Track also has these and brings ride height adjustment to the mix.