Hi I have a stock stroke banshee with a dune port, t5 pipes, plus 4 timing, stock reeds and carbs, coolhead 21cc domes I'm at sea level. I have 340 mains and my bike has been dyno tuned plugs are tan. I have a friend with a honda 450r with the Honda racing cam, port work, lowering kit, dyna cdi. As of right now we raced all day on asphalt and in the dirt we are about dead even every race. We raced from a roll alot also to take as much driver era out of it as possible. So I'm wondering would say 35 mm carbs or Cpi pipes be the next big increase or maybe vf3 reeds. I would like to be able to put a couple of bike lengths on the 450r. If anyone knows what will make the difference please let me know.. I just had the motor rebuilt so I do not want to have to go back into the engine to make it a stroker. I know alot people say stock carbs are good with a stock stroke and some say t5 pipes are good also. So I would like to know if anyone has seen a big difference with carbs or cpi pipes on a stock stroke bike with port work thanks..