Originally Posted by Fen335i
^ That's exactly what it is Mike...there are some pictures of it farther up the thread...they yank out some of the sound deadening material and weld it back together. It sounds really good IMO. But, we haven't heard how the drone is yet....Not a bad option though for folks that like the stock look, but want some volume.
That's actually a different mod. ACM's exhaust mod bypasses the central kidneys so the pipes essentially go straight through. You can see this in the welds. This gives the exhaust a more aggressive sound than the mod you mentioned - I've had it done as well and love the sound.