KESSTECH is the inventor of manually and electronically adjustable accessory exhaust systems with EC type approvals. 
The KESSTECH sound systems promise to impress not only with their volume, but also through their unique and unmistakable full sound, as well as their looks. 
The Electronic Sound Management Systems (ESM2/ESM1) have electronics that control the tone and the volume automatically. If the system is activated, all sound values and all power values strictly comply with theEuropean Directive 97/24. 
ESM2 exhausts are controlled dependent on the revs, speed and gear and are legally open even in idle running! All systems have an EC type approval and they are suitable to Bmw and H-D bikes.The advertising video of the company is superb.