You’re going to want to remove the cowel cover to gain access to the rear runners on the intake manifold. All you need is a Torx-25, and the rest is a piece of cake—should take about a minute.
With the cowel cover removed, you gain easy access to the rear. There’s our AEM manifold air pressure (MAP) sensor underneath that Modified by KC wired in, which takes the place of the air mass sensor.
We don’t know why people make such a fuss online about removing these factory intake manifold runner hose clamps. They were very easy to remove with a pair (or even just one) screwdriver. Just flip them off like you see here. You probably won’t be able to put them back on, however, so make sure to get some at your local hardware store. We got some replacement ones at Home Depot, and we only loosened the ones on the throttle bodies themselves, keeping the couplings on the intake manifold. This way we only removed 6 clamps instead of 12 (because there are 2 on each runner).
The 10mm bolt holding the lower portion of the clamp will probably be the most difficult bolt to get to, but it’s up to you if you want to put it back on. We didn’t just in case changing this TPS sensor wouldn’t fix our problem, thus reducing the time for another intake manifold swap significantly.
Believe it not, since Project E46 M3 runs on AEM Infinity, it will run fine as you see in the picture above, sans intake manifold and air box. We actually dyno test it this way in Part 10, too! Anyone care to venture a guess as to how it affected our power over the stock intake manifold, if at all? Tell us below.
Here’s the intake manifold removed (bottom), sitting next to Castro Motorsport unit we’ve already tested and will be featuring soon.