Yes. But not by themselves. You need a more free flowing exhaust to benefit. You cant have more air in without more air out. Short intakes do nothing but create turbulance. Longer ones create a more even flow. Go with a reputable brand and open up that exhaust too! Do like he said but also go with performnce plug/wires/distributor cap/rotor to really benifit from it. you will have imroed performance and fuel economy.
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Instead of drawing the air from your engine bay, a cold air moves the air intake point to the lower front of the vehicle away from the engine bay, thus exposing it to colder denser air (since hot air rises) and taking advantage of the forward motion of the vehicle to ram air into the intake.
it gathers cold air from as close to the outside air and as far away from the engine heat as possible and uses that cold air under pressure with fuel and an ignition to create a more effective explosion than it would with warmer air. due to the density of cold air compared to warm
As long as you have anti freeze in your car, you'll be fine. If you let your car warm up before running it hard cold air is actually better for it.
maybe 15 horse or so if your lucky.
the cold air intake changed your Mass Air Flow size, and your car will see, obviously, massive decreases in performance until it's fuel/air ratio is changed to accommodate the much leaner mixture. your car is tuned for the stock MAF, and that's why the stock one works fine. you have two options- 1. is buy another cold air intake with the same MAF size, or 2. take it in to get adjusted. once one of these happens, you should see an increase of about 10rwhp. so- I'd just get it tuned- after the fact, it'll still be cheaper.
Usually no, since the V6 will be of a larger diameter, and the shape may not fit with the V6 engine.
to tune up for speed you should start with a cold air intake, a super-chip for the cpu, and buying a better exaust