Sounds just like my old 4cyl Mustang Foxbody Racecar. I think if you use a Resonator just before the exit, that would cut down or eliminate any interior resonance. Thats what I plan on doing once some tuning becomes available. I have the same exhaust as he does minus the header and it drones like a champ.
2012 Ford Focus SE Hatchback Race Red. 203A Spec. Window Tint. K&N Typhoon CAI. FSWerks Race Exhaust. Weathertech Digital Fit Floormats. HIDs with Projectors. Build Date: 2/14/2012
Active Duty US Army. MOS 91E (Machinist). OEF Vet.