Thank you Nigel! Yes, my engine is sloping. It looks fantastic! It definitely wouldn't clear my Dunstall fairing. But what I am really afraid of, is that possibly it wouldn't clear the front frame cradle tubes or worse, that the front wheel might touch it when the forks are in full compression. Actually, when I bought my bike as project, it had a 2-1 exhaust on it. As I tried the bike for the very first time after rebuilding the engine, less than half a mile from'Yves' workshop on a 'legendary' Belgian heavy lorry road, I hit a 6 inch deep pothole with the front wheel while traveling at about 70Mph. The rear of the alloy mudgard made contact with the exhaust tube which pressed it onto the tyre. I will never know how I managed to keep the bike upright on the black stuff. Upon my return to the workshop a few minutes later, my face white as a plain yoghurt, and still shaking like Jamaican maracas on Carnival night, Yves wouldn't believe me, as we had checked the clearance statically before. But the tyre mark was there on the inside of the alloy mudguard. Off went the 2-1. I never had any problem since.