PARTS THAT CAN IMPROVE PERFORMANCE OF YOUR CAR
                     PARTS THAT CAN IMPROVE PERFORMANCE OF 
YOUR CAR
Paul Norman Jasper
Staff writer at Auto Parts University, whose 
replacement auto parts reviews and 
replacement car parts reviews are popular.
Many parts, including bolt-on parts, can improve the performance of your 
car. However, before you plunk your hard-earned cash down, read the 
replacement auto parts reviews on the parts and brands. Some may give you 
a few more horsepower and some may give you much more. The types of 
parts also make a difference. For example, if you put a new exhaust on your 
car and it’s as restrictive as the original, you won’t gain much, if any 
horsepower at all.
Improving Performance with Exhaust
Always do your research before spending big bucks on an exhaust system. As 
stated above, if the new exhaust is too restrictive, it won’t improve much on 
the horsepower. However, if the exhaust isn’t restrictive enough, you could 
run into the same problem. You want the exhaust to go out of the cylinder 
quickly. A less restrictive exhaust allows more exhaust to get out of the 
engine, but it doesn’t go out as fast because the less restrictive exhaust 
creates less pressure to suck the exhaust out. Mufflers should be based on 
engine size, header size, and other factors.
Improving Performance with a Better Radiator
The cooler an engine runs, the more efficient it is. However, there is a limit—
if the engine is too cold, it will use more fuel and produce less horsepower. 
When you choose a radiator that cools better, make sure it doesn’t cool the 
engine too much. As with most other replacement parts on a 
street/performance vehicle, bigger isn’t always better. Look for a radiator 
that has the maximum flow rate for the size of your engine. Aluminum 
radiators cool better than copper-brass radiators. In most cases, crossflow 
radiators cool more efficiently than downflow radiators. If you have an older 
vehicle that uses a downflow radiator, a crossflow radiator may not work well
—if you are able to find one that fits.
Improving Performance with a Cold Air Intake
A cold air intake is usually one of the easiest bolt-on parts you can add to 
make more horsepower. However, many brands claim they add up to 20 
horsepower. This usually isn’t the case. As with all engines, your engine must 
be configured properly to take advantage of the colder air introduced to your 
engine. A cold air intake isn’t going to give your four-cylinder 20 more 
horsepower, but it might give your souped-up V8 closer to that 20 
horsepower gain.
Combining a cold air intake with a better exhaust and larger fuel injectors 
also get you closer to that 20 horsepower mark. Remember, what does in 
must go out. Then the engine is only going to suck in so much air—based on 
the amount of gas that goes in. Most cars run on a 14:1 air/fuel mixture. If 
you want more cold air, you’ll have to increase fuel. If you increase fuel, the 
exhaust it creates needs a way to get out—you’ll need a freer-flowing 
exhaust.
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