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The Best Modifications to Make Your Car Faster

While you can't upgrade your aerodynamics package in a wind tunnel like a Formula 1 team, there are some upgrades you can make to your car that’ll instantly increase its performance without requiring the replacement of the engine or chassis. These suggestions are the best modifications to make your car faster while still being street legal.
Loss Weight
The heavy the car, the more it must tow, the slower it goes. An engine's horsepower doesn't change with the weight, but it can go faster when you decrease it. Even the driver’s body weight plays a factor, which is why racer car drivers value slenderness over muscularity. You can apply this same method of thinking to your car. Steel is sturdy and heavy, so you can increase your performance by converting car parts to lighter materials such as aluminum or carbon fiber. For example, an aluminum and steel drive shafts have about a 10-to-20-pound differential between them.
Cold Air Intake
Every engine needs two things to run: air and fuel. So, the more air and fuel it receives, the more horsepower it can produce. Cold air is denser than when it's warm, so the engine can create more torque from the added air supply or a modified intake. This mod means your engine is less likely to overheat and fuel will burn more efficiently from the installation of a cold air intake.
Fuel System Improvements
So, now that you've added denser air to the engine, increase the fuel rate to get those pistons pumping faster. Higher flow injectors, higher flow filters, higher flow pumps, and bigger gas lines are all modifications that will enhance your engine's fuel intake. Besides, you'll need more fuel to match your new cold air intake because the denser air will also need more energy to be effective. Every modification you make to a car will have a ripple effect throughout the vehicle, so some changes will force you to make additional adjustments to level out the car's performance.
Modifications That Don’t Affect Performance
Some modifications are commonly advertised as performance upgrades when they’re merely aesthetic changes—or even worse, ineffective. For example, while it’s true that deteriorated or broken spark plugs will negatively impact your performance, an aftermarket spark plug won’t be any more effective than a properly functioning one. Also, many aftermarket exhaust pipes will merely improve the vehicle's sound (only a true dual exhaust can lead to performance gain.)

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