How to increase car horsepower

High-Flow Air Filter:It can add 5 horsepower or more depending on vehicle Because  you're letting your engine breathe better, adding a small amount of power. For about $40-$250 for most applications, this is an excellent place to start...For better results + sound, take off your air silencer ( black tube in the fender connecting to the air box ) get more kick with a side of hearing your engine inhale.Here the video that i find on youtube that show How to Install  Cold Air Intake

Performance Exhaust: Have a muffler shop that knows what they're doing upgrade your exhaust system. The term for what you want is a "header-back" exhaust. That mans that it will be built up from the exhaust headers back to the end of the car (pretty much straight from your engine to the tailpipe)or you can buy exhaust  systems      formtheiswebsites-http://www.andysautosport.com/ http://www.carid.com/. I-4 cars should go up to 2.5 exhaust, unless a turbocharger is equipped, then 3" is acceptable. V6/V8 cars should have 2.5"-3" exhaust all the way through. oPerformance Exhaust will greatly increase the amount of noise the car makes. The exhaust will change to a deep, rich tone, that is appealing to some people, but will be much louder than stock. Not recommended for people who like their car to be quiet.


Performance Cams: These are an engine part that will make your car rev up more quickly. These are on the expensive side, and are difficult to install, but work in excellent conjunction with header or exhaust upgrades.

High-Flow Exhaust Headers: These are expensive and will add only a small power gain. This is what a person does when they have exhausted other possibilities and are willing to accept a high cost upgrade for a small performance gain. Exhaust headers go well with performance exhaust.