AM used to sell complete X pipe true dual exhaust setups. I have one on my 4.0 from Ford Performance, they had kits from Pypes that included everything, even half dome caps to cover a bad bumper cover cut out, and one to match the other side. I don't know if they even sell exhaust anything...
Try changing out your TPS. Mine did exactly the same thing and I changed the throttle positioning sensor and revving issue solved. I did change it a couple of times until I bought a performance TPS which handles the upgraded CPU, injectors, turbo and tunes.
I just did mine - Like this past week. I ordered a wiper arm puller from Amazon, and the arms pop right off after a little maneuvering of the puller. I sealed all of my grommets instead of buying new ones and I still have a leak that drips right between the clutch and brake pedals - So if you or...
The whole bezel/trim panel pops off, but the chrome rings are plastic welded to the panel. In fact my panel is off right now as I'm chasing a rattle in the gauges and a water leak.
I've been having a similar issue. When it's hot and humid, or just humid, I have issues getting into 1st, reverse is tight and 5th can grind until warmed up. When it's cool and dry outside the car shifts fine. My diagnostic brain went right to clutch replacement on a vehicle w/69k on it...
I had a similar rev up/down issue, I replaced the throttle positioning sensor and it solved my issue. The TPS is an and cheap replacement ($70 at Autoany part store) and 2 screws. I've done it a few times, my 70mm throttle body screws them up in about 20k miles.