Does your X-pipe exhaust drone loudly?
chambered muffler = drone, abodyjoe, didnt you have those mufflers on your dart before? you can get some drone with strait thru mufflers, its all kind of hit or miss definitely the turn downs and probably the mufflers. i really doubt its your X pipe. i had some flow tech terminators on a mustang they had 3" tubes so i cut the cones off of them and built a 3" system for my dart. they had a decent sound to them when they were on my mustang no drone, not annoying. on the dart i did an X pipe and dumped it at the rear. it was awful. my dad used to roll up napkins ans stick them in his ears to go for a ride with me. i built the car in my brothers garage, he gave me a curfew to run it his nieghbors were complaining. it set off alarms like no tomorrow. i built tailpipes and it was like driving a different car but instead of droning all the time it had droned at cruise rpm. it sucked. i chopped it up and built a 2 1/2" system with a set of ultra flows and an x pipe much better, but im now wondering what was i thinking and why did i go 2 1/2". are you running a fuel cell? do you have the spare tire well in place? i would get a set of the dynomax round race mufflers and run them under the trunk floor as a resonator. im not really into all the noise. a little is cool, but id almost rather have none. i rememebr when you posted a video of the cuda, i told you i thought chambered mufflers sound great, on other peoples cars. wont ever go on mine again.