My experience with intake systems, "actual" performance gains are minimal (unless you're running WOT all the time while daily driving) and mileage gains are minimal as well (note that if you're looking for a mileage gain, you'll probably see one for the first few tanks).

Removing that sound chamber makes intake and engine sound more notable, which we perceive as "increased" power... lol but the butt dyno is very inaccurate.

Does Airaid make an MIT for the 3.7L? My recommended setup is to do a reusable drop-in air filter and replace the stock intake tube with something like the MIT. Cleans up the engine compartment, improves engine/intake sound, the filter can be cleaned, retain water intrusion protection.