I have the el cheapo cold air from Mustang Tuning. But, I am on a tight budget as far as parts go, and I couldn't resist an $85 fenderwell kit. I'm sure JLT and others like that make more power than mine because of good design and engineeing, but as far as I can see, as long as I have a less restrictive tube without anything to create turbulance, a good filter, and a good location to get cold air, then I'm good.
I emailed JLT about their intake fitting under my MM STB, their response is that it will not fit Guess ill just keep the K&N drop-in and get some pullies.