Laser 2 .......... Exhaust bungs ............. OMG
I think this may explain why my performance was sooooooo poor with the original 19 inch prop fitted to my DR750.
I know my new high 5 has them but didn't know they existed OR what the holes were all about at the base of the original prop. I just went out and checked now and, well you guessed it - they aren't there at all!