IMHO the best thing you can do is change the rollers out . i had all of Airdams work on one of my motors . it ran alot better. but for the money im not sure . this last motor has D&Ps rollers in it with stock clutches . this was the smoothest and best it had ever performed. a lot quieter and smoother with the RPMS set at 6800 . lots of Low end. for a 4 seater with 8plys .
Dean said awhile back that they had put a chart together with what roller work best with what mods and weights of the cars. you can call them, ask for Dean and see what he can recomend .
D&P performance 435-586-5172