Honestly, buying an intake for a N/A 4.6 is kind of a waste of $ unless you're going with a more aggressive cam setup and plan on spinning the engine a bit into the 6k+ zone.
The Edelbrock intake is an awesome piece, but it's more for engines that will be seeing higher RPM. There's a few people on here that say they didn't notice much of a low-end loss, so that's a bonus if you decided to go that route.
The Trickflow intake is nice also, but on an N/A car it's not an ideal setup considering the cost.
The Typhoon is strictly love or hate. I know someone personally who had one on his GT, and after some cleaning up of the runners and mild porting he picked up 20rwhp on a cammed GT. I have seen several people posting on here that they know people that have lost power, but only known a person or two that was first-hand dis-satisfied with the intake (which still says a lot). They're heavy, hold heat, and they're fairly similar to a PI intake. Not a real big winner unless you're boosted.