Stainless Bros 3.5in Normally Closed / Boost Open 304SS Valve

If you're looking to change the sound of your exhaust on demand, this 3.5-inch exhaust cutout valve from Stainless Bros is a solid option. It's designed to be normally closed, meaning your exhaust stays quiet and routed through the muffler as usual. But when you want that open exhaust sound, this valve can be set to open under boost pressure, letting exhaust gases bypass the muffler.

This valve is constructed from 304 stainless steel, which is known for its good resistance to corrosion, making it a durable choice for undercar applications. The 3.5-inch diameter is a common size for many performance exhaust systems. Installation will involve cutting into your existing exhaust piping and welding this valve in place, so it's a job best suited for someone comfortable with exhaust fabrication or a professional shop.