I have a slight drone with my magnaflow, but it doesn't kill me. It was 80$ and I sectioned it in place of the oem muffler. Sounds good at WOT.
I'm unsure if mopar still makes the 4in lift for the WK, but I know that superlift makes a great kit. Cutting and welding is required. 285-305 series tire. over 2grand just in parts for this lift.
RC makes a BB kit that is probably your best bet for a little boost. With wheel spacers you can easily fit a 265 under there. The lift is 149.99 i believe
If your going to play around with your engine I reccomend a afe cai and a fastman tb and a tune. I have a hypertech installed with the 93 tune and it made a nice change. www.airram.com
has some internals you can swap around. Plus some updated hight flow intakes you can install. Right now I'm looking at one for myself.
Good luck and welcome to jeep!