The idea behind an exhaust header is to eliminate the manifold’s back pressure. By making them the same length, it guarantees that each cylinder’s exhaust gases arrive in the collector spaced out equally so there is no back pressure generated by the cylinders sharing the collector.Click to see full answer. Beside this, do extractors improve performance?Performance gains, better fuel economy, better exhaust note, are all benefits of extractors. They run at their most optimum when coupled with a high flow catalytic converter and sports exhaust as these two elements are also designed to free flow and achieve a better ‘exhaust note’.Likewise, do aftermarket headers make a difference? An aftermarket stock header deals with the exhaust gasses in a much more efficient way, which improves the overall performance of your engine. Performance headers are more concerned with increasing performance rather than reducing the noise from the engine. Considering this, does a stainless steel exhaust improve performance? Performance wise, stainless steel exhausts will drastically improve the performance of your car, too. Although a stainless steel exhaust will last for a lifetime and not rust, unlike a mild steel exhaust, the heat will eventually change the colour of the exhaust, so bear this in mind.Do headers add horsepower?Exhaust headers work by making it easier for exhaust to flow out of an engine’s cylinders. Both long-tube and shorty headers will boost your vehicle’s performance by moving air faster and more effectively. But long-tube headers do the best job of building torque and horsepower from mid-range to top-end RPMs.