Sean
Seel out some inlet trumpets and fit piper X socks or similar. The noise is superb and will drown out and silencer mods. I have done this to my 1600HF and is amazing. I fed the oil breather pipe after narrowing the section into No3 cylinder sock! You can see these trumpets on ebay or
www.spitline.com (I think).
You will need to buy the kit with the back plate so the carb support is still used or you will suffer a rubber gasket failure.
See Angleorange's posts on his fulvia side exhaust.
Tim