Exhaust?
first off let me welcome you to the forum. I haven't seen were anybody with the 300 is running dual exhaust. personally I like to 300 with the muffler delete and only the two factory catalytic converters. Gives a great tone and doesn't interfere with the scavaging process. You might try YouTube and see if there is anyone with a 300 dual exhaust setup on there first. Good luck.

