I am thinking of an airbox change and looking for the best thing out there. I am considering Blackwing, Vararam, or Granatelli Dual cone setups. Water is an issue so I am leaning away from the Vararam a little. I am also installing a Garanatelli MAF. Anyone have any problems ? Some people talk about piston knock after changing the MAF but Granatelli tells me that it won't happen. I would appreciate any recommendations.