My adventures in a custom exhaust

Looks amazing
I’m going to do mine in the coming weeks, is drilling the pipe necessary for back pressure? I guess when I open it all up I’ll understand more.
 
A lot of work going on there, I like it however I just removed the whole apparatus and fitted an SC Project system that came off my Speed Triple. It shed 10.1kg off the weight of the bike.
That is by far, IMO, the best looking "aftermarket" looking option yet. I really like the look of the OEM unit. As for NON-oem, this takes the cake over all the others I've seen. Have a sound clip?