When you think of headers, you might think of a simple series of pipes that condense exhaust from the cylinder heads to the header collector. They look simple, but choosing the right headers can make all the difference. And, bigger header pipes is not always the right way to go. You need to choose headers for your engine and application. Headers with big primaries for the situation will not build power, or they build power in the wrong place. Check out this page about Exhaust headers.