Yours is Mac.
The AFM one might make power over stock, but I'm still doubting it, it looks metal to me. When making a cold air intake, you shouldn't make it out of a high heat-conducting material such as metal. Look at where our intakes sit, not 12 inches above a header. Go run your car around for 10 minutes, pull over, pop the hood and grab that metal "cold" air intake, and feel how cold it really is.
The stock airbox pulls air from the fender, so sticking the filter in the fender well is actually the same difference. The reason many of the CAI's screw the MAF readings is actually turbulent airflow. They may look sleek and smooth but don't let it fool you.
If you look at Jekyl's intake, you'll see that the inlet leads to a bend, before reaching the MAF sensor. At this bend, some of the air is going to want to spin horizontally, like a top, and leads to turbulent airflow to the MAF meter. The airflow to the meter needs to be straight and even (this is why the stock MAF meter has a screen in it). Because it's only measuring a small portion of the air coming in, and then from that calculating the real incoming air mass. If the air is rocky and turbulent, you could be getting more airflow through the bottom half of the meter, than the top half (where the sampling tube is) which means the calculation is going to come up short, and you'll be lean. Or you'll get more through the top half than the bottom, and now you're rich. Typically you get both back and forth, and your readings are all over the place. Very not happy.
If you look at the stock box, the box is simply a reservoir of air, it isn't channeled yet so it doesn't really have any direction, when it enters the tube, that tube is a straight shot to the MAF meter.
Personally testing filters and whatnot on a Dyno. I saw 1hp with a drop in panel filter over a panel paper filter, 1 more hp with the bottom half of the box removed, no filter, just the tube up to the throttle body (total of 2 hp, the box lid remained on to shield from fan wash) And a loss of 4hp with an open throttle body, no intake tubing. (no, bigger, wider, opener, is not always better, air velocity has it's place!)
What do these changes mean? Absolutly nothing, you can get these same variances in back to back dyno pulls without changing anything.
Just kidding, I got suckered into buying one (CAI), no gains but I can hear it suck air when I blip the throttle. Either that or I have a leak somewhere. Only good thing is it looks a heck of a lot better than the stock set-up.
I dont know what brand it is but it has a wide cone filter and it goes into the fender well.
I agree with some of your questions...(if that makes sense)...I still don't see thru a cai how the air is heated with the density of air that runs thru it...
