Customized, depending on torque or power requirements. The equipment is calculated on the respective cylinder by computer program and a lot of experience and then handmade. The aluminum mufflers are also handmade and very sturdy.
It is indispensable to make a special request when using e.g. Japanese cylinders on a Vespa, Lambretta, etc., because here the original Japanese exhaust will surely not be topped by its shape. The complete design and construction is a very time-consuming task. If desired, we need the whole vehicle, to determine the location, or the exhaust pattern perfectly.