Thinking of purchasing the Sirio S09-R engine described on Kyosho’s website as “While the standard engine has two ports, the "R" has three ports. The internal structure of the engine is processed in the same way as a 12-class race engine, making it truly worthy of the "R" title. It is in a higher class in terms of performance and durability, and has outstanding power at high revolutions.”

Would it be ok to use the standard KF005 muffler set that comes with the KF01? Or would I have to use the KFW019 Tuned Pipe set which is so rare these days?