Originally Posted by spork

Actually, not to make this a technical post, but you are wrong about the placement of the filter not needing to be in cool air vs. hot underhood temps. A compressor on a turbo will heat the air up. That much is true. But it only heats it up a certain amount. Lets say you've got 180 degree underhood temps, and the turbo adds 250 degrees to that bring it to 430. If you have 70 degree air come into your turbo, it will not heat up to the same 430 degrees. It may not be a 110 degree difference, but there is a significant difference. Then you factor in that an air to air intercooler is not 100% effecient. Figure 80-85% is doing pretty damn good. If you start out with a cooler charage going into the intercooler, you'll end up with a cooler charge coming out. It's simple math. Also, the air filter actually is only blocking the IC end take as it's hard to see in that picture. I've logged temps before and after intercooler and actually moved my air filter to the engine compartment to prove this to a guy in the past. Every degree counts when your talking about intake air temps. The cooler the air, the more dense the charge, and the more power you can make on the same amount of air injested into the engine. Many people have debated this, but I've seen very few that do anything other than bench race on this topic. I've logged temps and done comparisons. Anyways...enough about that...