I am looking at a Flowmaster catback kit for my 2012 Hemi. Worried about the sound and drone when MDS kicks in and engine drops to 4 cyl mode. I am looking at the quieter kit with rear resonators. I searched youtube and found many start ups and revs which sounds great. Have not been able to find a good sound clip when in eco 4 cyl mode. Anyone have one or could describe the sound in 4 cyl mode? Thanks in advance for any help.