I took the resonator off my XK and installed a nice looking Gibson stainless tip and that was actually the first mod. I done. I wanted to delete the resonator before changing the muffler as a test to see if I can get a bit better exhaust note and not start cobbling up the whole exhaust on a vehicle with less than 24K mi. Since I like the way my 4.7 sounds (especially when I nail the gas), I will ride around with my stock muffler until I can justify replacing it with something better. I will likely put a 50 series Flowmaster on it in a couple years after I get more miles on it, but for now, seems wasteful to take off the stock muffler when I am happy with the sound I get with the resonator delete and all the extra power I've gotten with all the bolt ons I've done.