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Tires have a major effect on the way your car looks and feels. If you are interested in increasing the functionality of your vehicle, getting a higher-quality brand of tire for your vehicle can change your experience of driving it. This is an important trick whether you're a car modding or a "casual" car owner.  Keep your area's weather in mind when you pick out tires. Some tires are specially designed to function in rain or snow. Generally speaking, the bigger your wheels are, the less responsive they'll be when you're driving. Try to strike a balance between form and function with your tires. Newer vehicles are regulated by an internal computer processor, called an ECU, or "Engine Control Unit". These computers determine how much fuel is injected into the engine at different RPMs. If you want to get an added boost (and fuel economy) from your car, you can buy an input panel for your ECU and have it installed in your car. Although it's only recommended you change an ECU's default settings if you know what you're doing, you can squeeze some extra power out of your car just by improving the efficiency of  parts you already have. By cutting out fuel at precise times, you can make your car "backfire", shooting a burst of flame out the exhaust when you rev it. This is not recommended for street vehicles however, and should only be approached if you know what you're doing. Your car's exhaust has a solid effect on your car's power, as well as the amount of noise it makes. Having you exhaust and muffler replaced with something more sleek can help improve the vehicle's efficiency. Some car modders also enjoy playing around with the sound a car makes. Removing a muffler will make your car sound considerably louder. While this might make the car sound faster, it's also inconsiderate to other people using the road. Your suspension is typically padded with rubber bearings to improve the car's feel and handling. However, these erode with time. Replacing them with durable polyurethane may be a largely invisible improvement to your vehicle, but it can do wonders for a vehicle's handling if you've been driving it a while.
Change your tires. Reprogram your vehicle's ECU. Upgrade your exhaust system. Replace your suspension bushings with polyurethane.