Aftermarket exhaust systems are a great way of enhancing the performance of your car. Besides that can also be used for cosmetic purpose as well as to produce a beloved roaring and growling car sound which makes your car prominent and more prone of being noted by your friends.
The exhaust system acts just like a respiratory system of a man where the different gases produced by the working of the engine are provided a passage way or exit route through the exhaust tubing. When a man works out, the lungs helps in expelling out the carbon dioxide from the body and provides a departure platform. If the gas does not exit from the body we will suffocate and you know better what happens next.
So in order for an engine to work more efficiently, the best thing would be that exhaust piping are of larger diameter so gases exit more rapidly and there is less restriction for the gases to pass out. This benefit is what we gain when we replace a factory fitted stock exhaust system with an aftermarket sports exhaust system. Since they provide relatively a larger diameter piping, there is a less pressure of exhaust fumes which results in higher horse power but on the other hand a larger bore size of the pipe slows down the movement of the gases. So performance gain does not lies with fitting the biggest possible bore size pipe as it may result in the loss of low end torque, but an optimum size is suggested which definitely varies with the type of engine according to the RPM produced.
