I have Kooks LTH and cats, along with an ECU tune. The combination adds +40% more torque at 3k RPM, which transforms the way the car drives. You can hear it and see the dyno chart on my YouTube channel. If you are only interested in a sound change, then I would not do LTH. If you want more...
That's interesting. I put that I owned two Mach 1s, and several Ford Focus as my dailies. I showed them my YouTube channel featuring my Mach 1 with a few thousand subscribers, and also that I'm a participating member of a large UK Mustang club.
I've often thought about a Wavetrac. Seems like a great piece of kit, although seems like not as popular as other rear diffs. Keep us updated as you drive more. Remind me, are you NA or boosted?