They're not straight open pipes. They have a mechanical baffle in them that helps hold on to the bottom end and midrange you loose with open pipes. No dyno, but the seat of my pants says it's QUITE a bit stronger than stock. As far as jets, I'm running 130 mains, stock 42 pilots, Thruxton needles with no shim, and the Kawasaki vacuum springs make a very noticeable difference off the line. A/F mix screws are set at 3.75 turns now so I'm going to install 45 pilots and get my A/F screws back closer to the stock setting. Sorry about the lack of new pics but the weather's been shite the past few days
