^^^^ Awhile back i saw a youtube video of the "X Pipe" on several vehicles, and on a turboed stang(just one of the few cars) the car made 18WHP over just not having an X Pipe????



ill find the video...

 

I know that "true two" exhaust is not very desirable, for the very reason that wheel said. But "H" pipe and "X" piping exhaust balances out that issue.

 

I think doing a dual exhaust on an RD would be dumb because theres only one notch in the bumper for the muffler. It wouldnt look right with 2 muffler tips sticking out on opposite ends, unless you had a different bumper with 2 notches.

 

this would be the only duAl exhaust i would recommend for an i4 motor. the other style (middle pic) is only for show and adds like 20 pounds of unnecessary weight. but like i said, you might not like the sound of that type of baffled single in, dual out exhaust. even srt4 owners have been known to switch to a single, straight through style exhaust.