Upgrading your intake with a 4 inch silicone 90
Getting a 4 inch silicone 90 to fit perfectly into a cramped engine bay can feel like a high-stakes game of Tetris, but it's usually the exact piece you need to finish a custom build. Whether you are working on a high-horsepower diesel truck, a turbocharged street car, or even an industrial air filtration system, that 90-degree bend is a staple in the world of custom plumbing. It's one of those parts that you don't think much about until you actually need one, and then suddenly, the quality of that single elbow becomes the most important thing in your garage. ...