The combination of the Gibson exhaust that I did last week, and the intake, have really brought the 4.6L to life! There is a noticeable increase in power, the exhaust tone is great, and when you open up the throttle, the intake really wails.
Another unexpected benefit is that it seems to be running much smoother at idle. I've been unhappy with the rough idle since my X was new, and this seems to really help with that a lot.
As far as I am concerned, this has been another really worthwhile mod. Thanks to Flik Customs for the great service and unbeatable prices.