Stihl MS661 Petrol ChainsawAll ported chainsaws are built to order. Current lead time on ported saws is approx. 12 weeks from date of purchase. Please get in touch if you have any questions on lead time. Port work includes: Cylinder base and squish band machined. Exhaust, intake and transfer timing changed. Ports cleaned up and reshaped. Ignition timing advance. Muffler mod. The saw pictured comes with Max Flow filter system, WCS 3 point dogs, WCS Bark Box and Top cover dyed