Differences can be made on your car by altering your exhaust system. Price normally comes into the equation when it comes to manufacturers making exhausts, so performance may suffer. The other thing is to make a standard exhaust system cheap and quiet it has to be fairly restrictive. Fitting a less restrictive type exhaust, gives you more power to the engine.
One of the first things to look at is the manifold section of the exhaust. The standard exhaust fitted to cars usually have sharp bends in them and are normally made from cast iron. The gasses get restricted because of the bends. Even checking that the ports of the exhaust matches up with the cylinder heads can make quite a difference. To get a good match, by matching up the ports using a small grinding stone on a drill can make a big difference. How the manifold is designed also has a difference. The four-into-one or four-into-two-into-one make are generally a better design than other types, so if your car is fitted with one of these types you could be alright to start with.
After the manifold it is then best to look at the silencers on the car. The normal silencers will tend to be pretty restrictive as they tend to push the gasses through a U-turn to get them through the silencer baffles to keep the car quiet. So buying a new one is not an unusual gift for men to buy for their cars. Fitting a straight through system instead with maybe a slightly larger bore can help eliminate some of these restrictions.
You will have to be careful about going to large a bore as some back pressure is still required to help with performance. If you loose all of the back pressure you could actually loose power rather than gain it. Some of the back pressure is needed to pull the gasses from the engine, so having a tuned exhaust for the car is more beneficial. This is why if a car has no exhausts the car will not perform well at all. So if you are considering buying an exhaust as a present for him, make sure it is suited correctly for the car. You may have been in a position in the past where your exhaust has broken as you have been driving and you can tell how much power is suddenly lost.
A worthwhile check is to make sure that your replacement exhaust is still legal as they will make more noise than the original ones. Some people like the sound of these more noisy exhausts, but be aware that on long journeys, this loud noise could be quite irritating. For greater improvement still is to change the manifold for a free flow tubular type but for normal road use it is best to try and fit a system that will improve the cars mid range power for better acceleration and overtaking capacity rather than the top end power.
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