Don't expect any real performance improvements from a cold air intake. They are just eye candy. They may possibly flow air a little better, but no gains are from cold air. Here’s why.First, you need to think of your engine as an air pump. If your 1.5 liter engine had the perfect cylinder heads, perfect camshafts, largest possible valves, perfect intake manifold, at 6500 RPM, it can only flow about 172 CFM of air. I doubt you have these perfect engine components, so the engine flows considerably less, as much as 25% less. It's not as though you are feeding a big block V8 with a big Holley carburetor. So how much airflow do you really need?Next, you need to examine the throttle body and the tube that connects it to the air filter housing. I will use my car as an example. The engine is a common fuel injected, 3.1 liter V6. On this engine, if you measure the diameter of the throttle plate, it is 2.035 inches (52 millimeters). If you measure the diameter if the stock pipe that connects the throttle body to the air filter housing, it is 3 inches, (76 millimeters). Since the stock pipe connecting the throttle body to the air filter is already 50% larger then the throttle plate, adding an even larger pipe will not flow any more air than can already pass through the throttle bore. No real improvements here unless you also add a larger throttle body and enlarge the throttle opening in the intake manifold.If you examine the air filter housing you will see that it draws its air from an opening in the radiator core support, drawing air from in front of the engine compartment. This air is already relatively cool.On a cold air intake, even if it has some kind of intercooler, it will NOT cool the air any cooler than the ambient outside air temperature. With a V8 engine, you gain about 1 horsepower for every 10 degrees Fahrenheit drop in temperature. Therefore, even if you could drop the incoming air 50 degrees, you gain a measly 5 horsepower. These gains are proportionately less on smaller 4 or 6 cylinder engines. So they are hardly worth the expense.Another thing to consider is that your engine is equipped with an EGR (Exhaust Gas Recirculation) valve. This device dumps hot exhaust gas from the exhaust manifold, into the intake manifold. A cold air intake can't make a difference over this extremely hot gas. Your engine is tuned to operate with this so it is not a problem.You can accomplish the same effect by fooling the IAT (intake air temperature) sensor located on the hose that goes from the air filter to the throttle body. Un-plug it and put a 100K resister to bypass it. Your computer will think it is ingesting cold air all the time. It will increase your fuel delivery, and give you a little more spark advance when you accelerate. It won't affect anything else, but it will wake it up a little. You can get the resister from Radio Shack for about $1.The air filter used in the cold air intake is the only component that may give you any real improvement. But with fuel injected engine, avoid the ones that use the washable oiled gauze elements. If even the slightest amount of oil from the filter gets on your Mass Airflow Sensor, it will foul the sensor. It will send erratic signals to the engine management computer. This will mess up your fuel / air mixture to the point that you could have even less power than you had before you added this component. If you already have one of these types of oiled air filter elements, you should clean the Mass Airflow Sensor with the correct cleaner every few months. Use Mass Airflow Sensor cleaner, and not carburetor cleaner, or you will destroy the sensor. Instead of the cold air intake, I would just simply add a low restriction air filter element.For a little bit more than a cold air system, you can purchase a dry nitrous oxide system. For about $350 - $500, you can install a dry nitrous oxide kit that will add 50 - 75 horsepower to your V-Tec. This will give you performance gains you will actually notice. For a little over $500, you could install a wet nitrous system that could give you 75 - 125 additional horsepower, but with this, you risk breaking parts.Checkout the Summit Racing Website.The bang for the buckCold Air IntakeCost = $200 Average. Horsepower gained = 10 HP, and I'm being generous. About $20 per horsepower gainedNitrous OxideCost = $500 Average. Horsepower gained = 100 HP Average. About $5 per horsepower gained
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