If headers are so efficient why arent they installed at the factory?
Auto manufactures install exhaust manifolds because they are cheap to produce, take up little space and have a higher margin for error in manufacturing. All of this comes at the expense of performance with poor flow characteristics, heavy weight and unbalanced exhaust pressures. Headers require more precision and craftsmanship in manufacturing but they are rewarded with smooth tuned and balanced exhaust flow allowing air to travel through engines more efficiently with the less restrictive backpressure. With Headers, each exhaust port has an individual primary tube that merges into a common collector. The balanced integration of dissimilar firing exhaust pulses generates a scavenging effect that increases exhaust flow and balances back pressure in the cylinder heads allowing the engine to make more power. Installing exhaust headers is an essential step to achieving the potential out of any high performance engine. If you are building up your motor, headers should be at the top of your l
