The Turbosmart Kompact Plumb Back Kit is a high-performance upgrade for the factory plastic diverter and bypass valves fitted to the BMW N54 twin-turbo 3.0L (135i, 335i, 535i, Z4 and more). It replaces the plastic-and-rubber system with motorsport-proven billet aluminum valves running Turbosmart's boost-balance technology and a 28mm high-flow positive-sealing piston, recirculating boost back into the intake as a direct swap for the OEM units.
| Type | Kompact plumb back kit |
| Operation | Recirculating (plumb back) |
| Fitment | BMW N54 twin-turbo 3.0L (135i / 335i / 535i / Z4) |
| Size | 28mm high-flow piston |
| Body | Billet aluminum with high-temperature O-rings |
| Quantity | Pair (2 valves) |
| Mounting | Direct OEM replacement |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2011 | BMW | 1 Series M | Base |
| 2008-2013 | BMW | 135i | Base |
| 2007-2013 | BMW | 335i | Base |
| 2009-2013 | BMW | 335i xDrive | Base |
| 2011-2013 | BMW | 335is | Base |
| 2007-2008 | BMW | 335xi | Base |
| 2008-2010 | BMW | 535i | Base |
| 2010 | BMW | 535i GT | Base |
| 2011-2016 | BMW | 535i GT xDrive | Base |
| 2009-2010 | BMW | 535i xDrive | Base |
| 2011-2016 | BMW | 740i | Base |
| 2011-2015 | BMW | 740Li | Base |
| 2013-2015 | BMW | 740Li xDrive | Base |
| 2020 | BMW | X6 | sDrive40i |
| 2008-2010 | BMW | X6 | xDrive35i |
| 2009-2016 | BMW | Z4 | sDrive35i |
| 2011-2016 | BMW | Z4 | sDrive35is |
