Doesn’t removing the cat increase the flow? If not, why would there be more popping on decel? What do you have to do to fit the PCV?Not a bad effort, can't wait to see them on the bike. I don't think you will see a change in performance as the exit pipe of the headers is only 44mm and like the old model that's the power limiter. As far as intake mods go. Unless you keep a good intake length (check out how long the runners are between the air filter and tb's) you will lose A LOT of midrange power. So don't go slapping on as set of K & N's or Ramairs. This baby is well developed within the legal constraints Triumph have to adhere to.