| Shouldn't be an issue with 50mm as said, but I guess they are 'track fairings' and there for not quite 'correct' in the fitting department!
You could try some of that silver (aluminium) tape you can get, and apply this to the inside of the fairing? I've seen some on ebay.
Or you can get some of that heat fabric tape (that looks a bit ropey IMHO) and apply that to the exhaust?
Or...modify the fairing to fit properly in the first place??? | 
Hybrid Mode
