MMP has the best chargepipe for your 135i, 353i, 535i or X1. It is made to fit the 2" style BOV which is the best for this car. You can buy a Tial or a similar one from Ebay or any vband style 2" (50mm) BOV . In my experience the ebay one works very good as I have personally tested the one on ebay and it works great and used it for years with no issue (just search 50mm BOV on ebay).
This pipe will improve overall engine and turbo performance by decreasing backpressure on the turbo and also increasing throttle response. The chargepipe is coated in a high quality powdercoat black finish and also the flange is CNC machined to match the OEM flange and clip perfectly. Dual opposing 1/8" npt bungs are welded in and provided with plugs in order for you to easily add meth or nitrous or both into your chargpipe system but if not just leave the preinstalled plugs in.
Caps are included to cover your intake ports with clamps as well and clamps to install the chargepipe are included.
Lifetime warranty included
BMW model fitment:
2012-2015 E84 BMW X1 35i
2008-2012 E82/E88 BMW 135i N54 & N55 including 1M
2007-2013 E90/E91/E92/E93 BMW 335i / 335xi including 335is
2008-2012 E60 535i / 535xi (OEM Twin DV option does not fit E60 models