The cylinder has a special, screwed-on exhaust port, which enables a perfect transition of the pressure wave into the exhaust and also guides the exhaust duct around the shock absorber. For this reason, only exhaust systems specially manufactured for this cylinder, such as the M3-200S exhaust shown here, will fit.
Scooter Lab UK has also looked at the Quattrini setup, click here for the report:
Quattrini adds 30% extra power to his 2-stroke kits | TUNING