Zep has already replied to you, so you are in safe hands. Now you just need to make a decision..
;-)
Sounds like you’ve made some great and needed upgrades already - well done.
With regards to X-pipe. I doubt you’d regret it knowing what upgrades you’ve done so far. The X-pipe does not change the fundamental note of the exhaust at all. What it does is;
in Sport mode, with the valves open, it turns the volume up by 10% and adds fabulous pops and crackles.
In ’non-sport’ it sounds exactly as it does OEM, best of both worlds I’d say! It’s got to be pound for pound the best inexpensive upgrade there is for a 4.7.
Contact Marios at Autoshield for one or I do believe SportsItalia now supply one as well.
Post up some pics and let us know how you are getting on.