Hi Moggy.... yes, you probably will have to make some small changes to fit them. But hopefully it will be just a small bit of trimming on the R/H lower fairing where the pipe emerges. This is because standard pipes are squashed flat at this point, and these are nice and round. And maybe a little bite from inside the front V-piece louvres where the pipe passes the front cylinder head.

You'll get these problems with pretty much all race pipes for the 21 unfortunatly.