Sierra 18 4456 Exhaust Protector Valve Review

This exhaust protector valve is an excellent accessory for any automotive enthusiast. As a result of my tests I determined that this product works incredibly well in reducing noise and protecting the engine from overheating .The valve operates smoothly and efficiently. One downside is that the installation process can be a bit tricky for those without experience. Overall, a great addition to any motorcycle for its protective benefits..

Great product so far! Our two-man boat with 4 exhaust pipes became a bird house on the boat lift. Placing these flaps over the exhaust pipes has previously kept birds out and also helps keep water out when reversing. They're a little pricey for a simple concept, but other than that I love them! Let's see how long they last! The only suggestion I would make to the manufacturer is to reinforce the rubber compound on the valve as it is flimsy and can wear out and crack after a few years of use in…