We took my kitty off last night. We made a homemade front pipe. I still can't get over how quiet the truck is. The only thing you hear now is the loud air coming out of the tailpipe. The turbo seems to be a lot louder too. When the tac hits 2500 you can hear a little of the rumble like the lb7's. I was hoping that it would be louder. Oh well I still love the truck.