Improving Auto Performance with an Exhaust Manifold

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Improving Auto Performance with an Exhaust Manifold

Several aftermarket or sports exhaust and intake system components significantly increase auto performance by improving airflow. Fitting an aftermarket exhaust is pointless if the exhaust manifold remains standard because the manifold affects the rate at which spent exhaust gases leave the system to make place for fresh air. Consider factors such as materials, coatings, and design when choosing a performance exhaust manifold.


Exhaust Manifolds and Auto Performance

An exhaust manifold channels exhaust gas away from the engine. Removing exhaust gas faster means that fresh air enters the engine faster. Increasing the amount of fuel and air that reaches the cylinders increases power. A standard exhaust manifold restricts airflow, but fitting an exhaust header or performance manifold resolves this issue and decreases backpressure. Installing an aftermarket intake manifold or exhaust header increases torque and high-end power.


Exhaust Manifolds vs. Exhaust Headers

Factory-fitted, standard exhaust manifolds typically consist of cast iron and do little to improve performance. In addition, they are prone to cracking. Cast iron manifolds carry lower manufacturing costs than performance manifolds that feature high-flow ductile iron or stainless steel casings do. Fitting an aftermarket manifold boosts torque for increased low revolution power and improves fuel consumption. A performance exhaust manifold is a bolt-on part that requires little maintenance. An exhaust header is also a bolt-on accessory. This is the array of pipes on a performance manifold rather than the manifold casting. A manifold header improves the engine's ability to push exhaust gases out of the cylinders. A combustion engine produces power during the engine stroke when the fuel in the cylinder ignites and expands, generating power. An exhaust header reduces manifold backpressure by supplying each cylinder with its own exhaust pipe that leads to a collector. This exhaust accessory is easy to install and modifications require little technical expertise. Headers require occasional re-tightening.


How to Choose an Exhaust Manifold

Look for an aftermarket manifold in lightweight tubular or stainless steel. A stainless steel manifold offers improved corrosion resistance and has an attractive chrome-like finish, but commands a high price. Steel with an aluminium coating is cheaper, lighter, and corrosion resistant, but rusts if damage compromises the aluminium layer. Thermal insulation prevents heat loss, reducing the temperature in the engine bay. Exhaust wrap provides excellent insulation because it envelops the manifold completely. However, it can cause premature manifold wear. Ceramic paint reduces heat to some degree, but a ceramic mixture coating offers superior insulation and durability. Choose a pipe configuration suited to your car's engine and exhaust system. A 4-2-1 manifold has four pipes leading from the ports into two pipes then into one pipe. This manifold is suitable for a four-cylinder engine or one bank of a V8 engine. The 4-2-2 design allows for twin tail pipes. Consider having the manifolds ported and polished to aid airflow.

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