I've only heard good things about them, i believe ESX uses them in even the simplest of their kits. I've also always heard of having to take the mani off though, but K-Y could do the trick, haha. I'm not so sure how simple it would be for a shop to fabricate a metal one since of the fit and how it has to taper to 2.25 inches or whatever. There are also a bunch of connections to that hose. Let me know if you notice a significant difference with/without tuning. I was looking into one and accompanying it with a big-maf intake once i got an EMS.