The plastic factory airbox is good at muffling intake noise and enhancing low rpm/low-speed engine performance but becomes very restrictive when the engine is operating in the higher rpm range – where most performance drivers need it.
Notes
Audi A3(8P) 2.0L TDI 140HP 2010-2014, VW Golf VI 2.0L TDI 140HP 2010-2014, Jetta V & VI 2.0L TDI 140HP 2009-2014 with engine code CBEA and CJAA only.
2012-14 VW Passat 2.0L TDI 140HP with engine code CKRA and European VW Golf MK6 2.0L TDI
