Just wondering what kind of power difference i can expect when going from Toomey T6s to Cpis or Shears. My bike is a 421 cub 4 mill long rod, 39 mill pwks,billet cross hair intakes, VF3, pro design cool head, 19cc domes, +5 timing, and the damn T6s. I hope it will be worth the 600 for new pipes.