Hi, really don't know the OD of the pipe but sounds great, might have to try it myself if you succeed very fun indeed

__________________
2012 XT660X - Red (not for long)
-Black Handguards
-Removed pillion pegs and grab rails
-LED tail Light
-Mini Arrow indicators
-Few stickers
-Co2 Mod done
-Custom plastics to come soon hopefully
-Carbon wrapped plastics sometime soon
-SP Engineering Carbon Stubby exhausts with Beowulf link pipes (in progress (short on funds to do it))
-Snorkel mod
-7x5" Plate