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Exhaust valves can make a dramatic difference to the sound levels and “drone” when combined with the correct muffler.
These valves are vacuum operated and are commonly used as Original Equipment in high end performance vehicles.
The use of valves allows your car to turn from a daily driver to a track monster with the press of a button
Each kit is supplied witth
Current stock of these valves are “normally open” but can be ordered as “normally closed”