hey quik i do understand ill need a retune ,but my ? is will they work with my retune.im getting an sd tune very shortly.but he wants me too get the bigger inj cause of my mods and i guess the 42 are or can be diff too tu ne also ,from my impression.i just would like too know if when i get the retune these will work ok? i though whenn i spoke too him that he said he could cut down duty cycle if they are [too big].thanks.