Most people do not understand or realize the amount of power hidden inside their import car. Usually these cars are well tuned "out of the box" but there is still horsepower hidden under the hood you can get out with a little modification.
The first thing you can do is purchase an air intake. There are many different types of air intakes, the best thing is to do a little research online or ask a trusted auto mechanic. There short ram intakes, air cooled boxes, cold air intakes, etc. The most efficient and reliable air intake I thik is the Cold Air Intake. This alone adds about 5-7 horsepower depending on your vehicle. This part usually costs around $200 if you want a decent one. Whatever you do, don't buy into the cheap ones "on sale," you will be quite disappointed.
Now that your car is takin in more air, you also need to allow it to leave your car. Getting headers and exhaust gives you more backflow and increases the amount of air leaving your vehicle. Headers come in many different sizes and shapes. By installing headers you car will gain an additional 5-10 horses. Again make sure you buy quality parts, not cheap junky parts. This will usually run around $350 for strong welds. If you are experienced you can install it youself or have an experienced mechanic install it for you.
Exhaust is another critical part to increase the number of ponies you have under the hood. When purchasing an exhaust, it is very important to buy the whole system, not jus the muffler. This should run you around $500-$750 and will drive your horsepower up another 12 horses. Some good brands for exhaust systems are greddy, borla, and flowmaster. It again can be installed by anyone with car experience.
For just $1500 you can improve you horsepower by about 25-30 horses. This is enough to really notice a difference while you are out on the road.
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