KN Planning Super Dio ZX Super DIOZX AF27 AF28 Chamber Muffler Compatible with 50cc to 80cc<> Installation data for 60cc: This is a chamber where the engine rotates at around 8900 rpm. Commonly known as KN Planning Hawaii Export Chamber (Hawaii Chamber). It's not that noisy. It's a familiar chamber in Hawaii. AF27, AF28, etc. Individual differences For some car models, the tire is cushioned at the stand stopper position, so you may have to cut it down. Manufacturer: KN Planning Brand: KN KIKAKU Manufacturer reference: 8005