Think its that cat that was making noise.... i know they would slow up a car but damn.... im getting a little bit of backfire noise and other things.... car will barely burn out... LOL good thing the flow master exhaust will be here wensday... but does anyone have tips on gutting my cats on my catted H to hold me over till i get a off road H.... sucks that i spent money on a used catted h like 2 months ago... the guy probally got rid of it because they were clogging up... lol