the svt is alittle better, but the dyno they did didnt use the svt snorkle on the volant i dont think. Either way your getting basically the same gain, just one willl look and sound more stock, so if you want stealth go with the svt set up if you want the deep sound of the volant go with that. Oh and latly theres a bunch of people selling their volants for cheap, theres a few on ebay too if you want to check em out. Anyway ill try to explain the two hole thing. In the bottom of the volant box, there is a hole for the snorkle to go into. On the ram air scoop there is a hole where the snorkle hose goes into, why they made it this way im not sure, maybe they thought it woudl provide better gains having air coming in from the top and the bottom of the box. Anyway you can leave the bottom hole open on the box, but not advised b/c thats right next to the engine and ull be sucking all the hot air in. Also i think its kinda pointless to but the snorkle tube into the hole in the ram air scoop, so what is done on mine on both the box and the ram air is i plugged each hole with the bottom of a plastic bottle, and left a small hole for air to come into no more bigger then the width of a pencil. If you cant get the ram air, and honestly its alittle pricy for the gains that you get, which are not much at all, just get a svt snorkle and use it with your volant.