Guaranteed to increase horsepower and top speed if the rest of your engine is in good condition. This exhaust is closer to a chamber in performance but looks like a standard Dio muffler. It is designed with bigger diameters throughout as well as less baffling. Also weighs less than the standard pipe.
Honda Dio AF27, AF28 SR & ZX (ZX needs derestricted CDI to take full advantage)
AF18, AF25 (also SP)
Honda Tact with AF24E engine
SYM DD50 and possibly SYM Arnada with upright engine
This will bolt straight up to the engines listed above for more performance and top speed. Slightly noisier than standard, with a higher note. AF24 and AF18/25 engines may need rejetting for best performance. This will bolt up to AF24 Giorno too but you would need to cut the rear cowling to allow the exhaust to exit properly.