I replaced the OEM Exhaust n my N/A with a Magnaflow Cat Back it P/N 16633. I
t went together with no problems other than the rear hanger need some prodding.
I replaced the exhaust on my SRT6 with the same it and mods. the first
8 to 10 inches from the cats back is a dual H section for resonance, the rest of the exhaust is dual all the way. The installer had a tubing bender and fabricated the one tail pipe to match the other. The 6 is noisier but if it bothers me I just take off my hearing aids.)
I do like the rumble and slight rap. Both OEM units can be refitted.

left to right top row: 16633 it on N/A Snow White, same car broader shot. next same car long shot.. Next SRT6 long shot to rear cats, SRT^ shot from cats facing rear..notice H pipe, Long shot of SRT6 bottom and removed exhausts.