On the stock N54 intake, air from the air filters runs into each turbo through two plastic tubes. Because of the tight fit of the E82 135i/1M, E60 535i, and E89 Z4 35i the stock tubes are made of plastic and are crushed and molded around the various components. This hurts flow and the plastic does not hold up well to heat and chemical exposure.
BMW should have used silicone! These silicone hoses are both stronger and better flowing than the original plastic and they fit in the exact same locations as original. Made from multi-layered silicone they also hold up better with increased boost and underhood temperatures.
If you're building the a high-output turbo N54 and want reliability to match your gains, you need a set of these silicone inlets.
There are multiple variations of turbo inlets, based on your current setup:
> DV or BOV: retaining factory diverter valves (DV) or your chargepipe has been converted to a blow-off valve (BOV). The BOV version has DV ports that are plugged (keeping the option of running DVs in the future).
> Inlet ID: select from 1.75" (stock turbos) or 2.0" (upgraded turbos) inlet diameter
Emissions Notice: This product is a direct replacement for the original and closely replicates or improves on the original in fitment, form, and function. It may even correct flaws or deficiencies in the factory design. As a direct replacement upgrade it has not been designed to trick or disable any emissions controls. It is designed to work with all factory emissions controls in place. However, it has not been evaluated nor tested for emissions compliance and is not legal for installation or use in California on any pollution controlled motor vehicle or in any state, province, or jurisdiction governed by, or which has adopted, CARB regulations for aftermarket parts.
Fits models below with N54 engine only.
BMW Fitments1 SeriesE82 / E88 (08-10) > 135i
E82 (2011) > 1M Coupe
5 SeriesE60 / E61 (08-10) > 535i
E60 / E61 (08-10) > 535xi
Z SeriesE89 (09-16) > Z4 35i
E89 (09-16) > Z4 35is