K series NA or B series Turbo???

[FastFwd]

15k is only for mods already have the car and it will be on the street 90% of the time drags only every now and again and not track work so i want something quick on the street
the 15k is only for the engine swap the car is efi and the only other thing i might need oot of this money is coilovers but still couple of months to off greens so i could save extra for them and thanks for all the help so far

So basically steet 99.5% of the time and 0.5% drag.

10% would mean that you would be dragging your car every tenth drive...