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The N55 E-Series FBO Kit bundles the bolt-on upgrades needed to take a BMW N55 E-Series engine to full bolt-on (FBO) status. It centers on a 5-inch front-mount intercooler, which the kit treats as required, and lets you customize the rest of the package to match your build. It suits owners chasing more power and lower intake temperatures without going to a big single turbo. Compared with buying parts separately, it simplifies sourcing but locks you into the kit's intercooler choice.
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Lowest price we've seen: $397.00 on Nov 13 at ARM Motorsports. Tracked across 1 store since Nov 13.
The N55 E-Series FBO Kit is a customizable full bolt-on kit for N55-powered BMW E-Series cars such as the 135i and 335i. It is built around an ARM Motorsports front-mount intercooler (FMIC) and the ARM N55 downpipe. The FMIC is a required part of the kit.
The 5" FMIC keeps intake air temperature in the ECU's safe zone, so the DME does not pull timing and limit power when heat builds. The 7" FMIC is 805 cubic inches, almost 30% larger than the 5" unit, for higher-boost applications where intake air temperatures rise quickly. The 1K FMIC has a 1,155 cubic inch core that measures 20" x 11" x 7.5" and is 270% bigger than the stock intercooler. Its fin pack is 20 fins per inch.
The ARM N55 downpipe is designed to improve exhaust flow and reduce back pressure. It is made to increase power, improve turbo spool and allow stage 2+ tuning. It fits OEM and aftermarket midpipes and uses an 80mm V-Band flange that suits standard and upgraded turbo setups.
