There is definitely a market for these. I have sold over 100 of my kits in the last 9 months. Everyone has been very pleased with them. Sport (no trac), no they are not CARB approved yet since they are custom made, not manufactured by a huge company like K&N. But I have yet to meet or hear of an inspector that has even taken a second look at these. They will pass, unless the inspector is an ass or you live in California. I am working on getting them CARB approved, but it is such a long drawn out process. The Volant kit is NOT out yet, they keep promising, but w/o delivery. I am trying to get one of their first kits so I can dyno their kit vs. mine (since there are some sceptics about the aluminum piping vs. the plastic), but will just have to wait on them. The one on Explorer Underground is just a prototype model. They used his truck to test out their prototype on, and it is the only one out there as of yet.