i put my off road h and cat back on last night and i am really impressed with the kit. i was amazed at how easily everythignl lined up. it was the best exhaust i have ever put on. the only problem i had was that 3 of the maiflod studs broke.... but i pulled them and retaped them and after that it took about 20 min to put the h and cat back on. the exhaust doesnt even rattle! you can hear the cat back on my friends 5.0 hitting the floor when u go over bumps and stuff but the mac u dont here. theres no drone like flowmaster eaither.it is truley the best and ezest exhaust i have hever put on. 2 thumbs up to mac and i would recomend it to anyone.