For those people, I highly recommend spending on maintenance if one must spend. This kind of product caters to the "omg i just got my e46 im so excited i have a couple hundred dollars to spend, wat do i spend on?" crowd. And it is highly doubtful any meaningful gains can be made. In other words, in short it would make your car drive and sound like a civic. In other words it would be at the expense of increased noise and low-mid range torque loss. If it did yield any gains, it would be in an area where you wouldn't want it. Not sure there's any benefit to using time and resources to develop this product. But you have to remember they are known mostly to the import tuner crowd for years and years and years. Also people here may think companies like this are new, exciting, woohoo, etc. My opinion on these sorts of topics."Been there, done that" needs to be kept in mind with these kinds of products. Your design here is truly not sealing off all heat sources that can affect the intake temp. OH, and what ^^^ he said about the expansion tank sitting right there, getting super hot, transferring all of it's heat directly into the cone air filter making any cold air that can get in there hotter. However I do not see any stock air boxes cracking apart, so BMW has chosen some good piece of plastic for this. Maybe consider plastic after all, as it is a much better insulator than steel, and won't rust but might break down over time due to the engine heat. They used powder coated steel that just rusts horribly after a few years. If you can somehow improve on the shoddy material AFE used for the heat shield, then you can claim an improvement. I would not really call it an improvement over the stock airbox at all, especially a marked increase in HP, unless you are strictly talking about the glorious sound it emanates. I have learned to drive with this cone and appreciate it where it should be appreciated. But it's given me my fair share of interesting idle fluctuation, etc. That being said, am I running a "cold" air intake in my car? Most certainly, I have an AFE one, and I love the sound and can feel the additional pull on then highway in high RPM's. This system does not really look completely sealed, and even if it were, you are using metal for the sides of the heat "shield" which absorbs the heat and transfers it into the area where the intake is far more than the stock plastic intake. Many on this site know and fully understand that just about all of the aftermarket cold air intake systems draw in more hot air than the stock air box due to the stock box's completely sealed ducting. This design is just about identical to all the other cold air intakes out there, so what and where is the benefit of your design compared to the others?
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