I installed 3/4 length Epcos and the K&N/freak kit a few years ago from Brent. I don't know which did what performance wise, but together they make an excellent mod. Haven't felt the need to change anything since then. As said, use the jets provided (160). If they don't snug up on the headers, you might want to seal with RTV or similar product. I didn't need it. They're pretty civilized around town, I don't think you'll attract the noise police. Blue-haired ladies, sorted and assorted retirees love the Triumph.
