ds wont work as well in stock bvm ducting, its a bit short and twisty. a Turbofan4000 would be more suited. its like a DS but with more pitch. by itself its not a faster fan than DS, but it would be a faster fan in that plane than a DS would be. and with higher pitch you can get higher watts faster with it than DS. DS doesnt wake up till 12s and up. For a nice turbo fan combo go nue 1912 1Y on 10s 5000 packs. should get you a solid 3200 watts in a light setup. Or spend the money and go vio which is a drop in.

Barry