Valvetronic Designs builds valve-controlled exhaust systems that give you two personalities from one setup. Valves open, you get full-bore volume. Valves closed, your neighbors won't call the HOA. You control the switch from inside the cabin, either through a remote or a smartphone app depending on the kit.
Their systems use vacuum-actuated butterfly valves welded into the mid-pipe or muffler section. The valves themselves are stainless steel, and most of their catback setups come in T304 piping with mandrel bends. Fitment covers a solid spread of European and Japanese platforms. BMW F80 M3, F82 M4, G80 M3, Mercedes W205 C63, Audi B9 S4 and S5, Nissan R35 GT-R, and a growing list of others. If you own something turbocharged and European, odds are good they make something for it.
The real selling point here is the range between open and closed. A lot of valved exhausts sound muffled when shut or drone when cracked open. Valvetronic Designs tunes the closed mode to stay genuinely quiet (not "quieter than straight pipe" quiet, but actually livable). Open mode lets the turbo spool and exhaust note come through without restriction. That gap between the two modes is wider than most competitors manage.
Installation is bolt-on for most applications. No cutting, no welding, no custom hangers. The kits ship with all the hardware, the valve actuator, and the wireless controller. If you want loud on a backroad and silent pulling into your garage at midnight, this is the setup that handles both without compromise.
