Sorry to revive a dead thread but i stumbled across this when reading about headers and I decided to drop my video for those interested in MRT H pipe with AWE Track Axleback which is pretty much MRT version 3 catback system. I’m showing the progression in sound from Stock NPP > AWE Track Axleback > MRT H pipe..I did my mod in this order to find the sound I was looking for.
https://youtu.be/zW2-PKqQh0Y