I have a 370LR motor that MP Racing built 2 years ago with a play port job, it time for a fresh bore so I asked about making more power across the whole band while its apart anyway (I want to keep all the bottom I can) They told me they can add two new boost ports that feed directly into the transfers. This is how the new cr250 is. This is supposed to let you keep throttle response and your bottom end so it sounds like the best of both worlds, step up to a race port but keep or potentialy increase my bottom as well. It sounds very cool. Any thoughts would be aprciated