Yeah You are right. They are Apollo pipes from A R Harley (Harleycustom I think) and boy are they Loud. There is a small baffle welded in and I think I am going to have to find some way of inserting something quieter. But the burble on overun in just Beeeeutiful. And yes my other bike is a 97 Fireblade. Need it for those quick trips over to Continental race meets with mates on GSXR's & Blases.
Standard British size I'm afraid. With loud pipes a small plate is a definite pick-up from the rozzers (Police)