i was going to buy cpp 7x12s but money wouldnt allow the turbo and those 1400 dollar injectors the 6x18s i have are already to big i think im losing power compared my old dap 250s and the a5k...i want to break into the 11s this summer,, i havent dyno'd my truck with the 6x18s i have now i was guessing some where around 600 it put down 537 with the Dap 250s im at 5900+ ft elevation ,, its hard to say if i gained power or lost power im running a 150hp shot of nos now to..