I have fitted a Remus Hexacone end can and de-catted two 1150 GS’s and now an F800GS. Not had the 800 on a dyno yet but both 1150’s were up on power. Magazine tests for the 1150 gave power figures at the rear wheel of 75 to 77 bhp, de-Catt and a Remus can and I was getting 85bhp at the wheel, which is what BMW say for the 1150GS.