The Cat is just a toy/weekend crusier for me. I only take it out on warm summer days, so as of now it's only got 3k miles on it. At 2k miles, I started with a 2.85 upper and made 753 at the tire. Even with 17" Welds and a 305 ET Street, it wouldn't hook much anything below 30mph. Still an enormous amount of fun to drive though!Interested to hear about your challenger.... Will it put it to the ground? And was it worth the mods or is it the toy?