If you're talking about the prepackaged deals (not diy), I doubt there's much off with them. I'd never use one of their filters though. I'm actually thinking about buying a ebay special or the like just for the maf plug/coupler,
The best way to do it imo is to make your own from the tutorial on this forum. I actually have one off of ebay that cost like $20-30. I've had it for several years, and it's actually good quality and the filter is good. The only draw back is that it's just a ram air intake, not a cold air intake. With a piece of intake tubing from an auto parts store however, it can be made longer. You can look in my garage and see the intake. The only draw back I had: For a few months after I got it, I had to tighten the silicone coupler to the intake. I'm guessing it was because it was new, b/c I would tighten it as much as I could, then a few days later, it would take a few more turns. Finally it settled and stayed tight. But for the money, it's decent. It even came with the bungs for the sensors
2002 Impala- SSC, AGX, 18" charger R/t rims w/8mm spacers, Magnaflow cat, U-bend delete, flowmaster 80 series crossflow, z28 tips, HAI, debadged, 35% tint, smoked headlights, full sound system
The only draw back is that it's just a ram air intake, not a cold air intake.
Yours isn't a 'ram air' as it's not using an air pressure differential (and incidentally, even an intake that does take advantage of the air pressure differential only makes a real difference at speeds over approx 100mph)
Your intake is actually a Warm Air Intake as it's getting air from under the hood which is warmer than ambient. This design helps with fuel economy but not usually with performance (usually hurts performance). You may get a small performance increase w/ a warm air intake if it significantly reduces the intake air restriction
If you are looking for a performance increase, buy a quality intake that draws cold air from either the fender well or behind the headlight (with a baffler to reduce heat soak)... You can build one as well, as long as you ensure that you are getting cold air
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