Need an ignition interlock device near Austin? Intoxalock is available at Custom Sounds #11, a certified Intoxalock ignition interlock installer. We can install your breathalyzer in cars, trucks, vans and other vehicles.Custom Sounds #11 is one of the leading car stereo stores in the country. Their Austin, TX branch has been installing Intoxalock ignition interlock devices since 2015. Custom Sounds #11 specializes in audio and security installation.