I stopped driving mine as I prepared to actually do that very thing, pull the trans to do some needed work and then I got deployed, then it sat because it wouldn't start when I came back and I just said **** it. I can part it out and make a good $1k+ off all the stuff, it's basically mint MNB inside, I have a Mirko splitter still in the bubble wrap, it has a Borla catback, BAT Y pipe, SPEC shifter, black Cougar wheel/airbag/column trim, auto open AND close modified sunroof, Mondeo digital dash display etc...
I sometimes do think of a 3L swap and getting it back up and running but I have the 98 GT to get my go fast fix and honestly I'm pretty sure my current beater (2003 Mazda 6 at 140k+ miles and still drives perfect) is faster and much more roomy.
Anyways like I said for your KB upgrade what sort of power are you making now? If you are making around 400whp you are throwing money away upgrading. If not then can you by turning up the boost? Also what sort of mods do you have to put the power to the ground? Looking at the pic in your sig it does not look like you have a fat set of tires out back and if you don't have some good chassis stiffening and work done to the rear end of the car I would go there before I even considered a new supercharger. Does not take a TON of power to get these cars to go really fast. Properly setup you can go a LOT faster than someone making way more power. I mean look at the new 5.0s, they run mid 12s off the showroom floor. Bolt on PI cars can run mid 12s...
2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.