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Now im sure you could cut the intake hole a number of different ways but with what I had available I used a dremel to slice the circle for the intake into 4 slices. This step is fairly easy once you know exactly where you want the metal to bend. I then used a hammer to define the bend more. To do this I placed a 2x4 in a vice and first bent the metal along the drawn lines I made. *Steps 4 and 5 are interchangible I guess.I bent my sheet first*

Step 3: Once you have a rough template (I say rough because more then likely you will have to do some more trimming to your metal) make marks on the metal sheet where you will be cutting the intake hole as well as where any intial bends and cuts will need to be made. Step 2: Find a nice piece of card board that you can use to cut and make a template as a guide to cut your sheet metal. Hammer + 2x4 + vice (used to bend the sheet of aluminum)

window weatherstripping) $3.97ĭremel (not required but helped to cut the hole for the intake) Weather stripping of your choice ( i got 2/3 in. I will do my best to explain step by step with the pictures I took and if any of the moderators find this helpful feel free to throw it in the e36 DIY library.ġx2 ft sheet of black powder coated aluminum $12.47 This intake, when installed on some of the models listed below, is approved for use in California under an Executive Order (EO, waiver).After searching and reading threads on heatshields, finding how ridiculously expensive they are to buy already made and being completely bored while on break from school I decided to make my own and IMO it came out quite well. We feel the black finish looks more at home in a BMW engine bay, however, polished intakes are also available (please inquire). Fully sealed intakes, like the Injen Evolution series, do a better job of shielding the filter from heat but a more open design produces a better intake sound. Each intake filter is protected from engine bay heat using a shield finished with a stealthy black finish. With greater surface area and better flow there is more air available to make more power. They also used the largest filter they could fit in the stock locations.

Injen tunes their intake designs to make more power but stay within the air/fuel targets set by the BMW engine computer. Injen engineers design their intakes to carefully manage air velocity and air pressure using the Venturi Effect and velocity stacks. They are one of the original performance intake manufacturers and have years of design and production expertise to share with the BMW market.