the thing is... the jl boxes are designed to deliver the best performance of the subs, so it doesn't matter what car its in, that sub is doing its job as good as it can, that said, from cars to suv's to vans jl's prefabs sound better than most people will be able to build a box, they might not be designed around the application but when the performance of the sub is optimal the difference in application is little enough to be neglected, the HO. wedge is worth the money for me... as far as the prowedge, you can make a box just as good knowing the dimensions and save some money