I can tell you first hand this exhaust sounds great inside and out. I rode the ILB M3 seen in video and it has ZERO drone. It's great for someone who might want an exotic sound, but can modulate/keep the M sound tamer in normal driving conditions. It's a no brainer alternative to a $3k++ M perf. exhaust. ACM will even option it out with carbon black or burnt tips (adjustable to any config.). They also have the option of sending you a full modded one (so you keep your original exhaust).
Awesome job by ACM.
AWE NR | SWIFT SR| PAGID RS29 | CANFlap | 6MT