Do you have to tune your truck after installing long tube headers?
Long tube headers constitute as a major change for the exhaust aspiration of your vehicle's engine. To compensate for the added air flow, and the relocation of the oxygen sensors, a new or updated tune is required. via
What does changing your headers do?
The goal of headers is to make it easier for the engine to push exhaust gases out of the cylinders. When you look at the four-stroke cycle in How Car Engines Work, you can see that the engine produces all of its power during the power stroke. via
Can changing exhaust increase horsepower?
But it is something to keep in mind if you're thinking about upgrading your car's exhaust. Aftermarket systems do add horsepower, but for naturally-aspirated cars, the improvements are fairly minimal. via