CTS Turbo O2 Pipe 1.8T (Transverse FWD)

The CTS Turbo O2 pipe is designed for use with a T31 style T3 flanged turbine housing (T3 2.5" 4 bolt) and CTS Turbo tubular cast exhaust manifold for the VW/Audi 1.8T transverse 20V engine. Our 02 pipe accepts all T31 flanged turbos and 38mm TiAL or 39mm PTE external wastegate. When used in conjunction with the CTS Turbo manifold and a stock placement downpipe this will effectively act as an intermediary pipe to connect your current stock/aftermarket K03 turbo back exhaust to your new big turbo. The flange that bolts to the turbo is T31 (2.5"), however shortly after the connection the piping flares to 3" as can be seen in the product photos.  This product allows for maximum flow, while requiring minimum installation effort. MADE-TO-ORDER part, production time is 20 business days. Fitment for LHD vehicles only, must use a CTS Turbo top-mount exhaust manifold.

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 6 applications

GTI

Make	Model	Engine	Years
VW	GTI		1999–2005
VW	GTI (MK4)		1999–2005

GOLF

Make	Model	Engine	Years
VW	GOLF		1999–2005
VW	GOLF (MK4)		1999–2005

JETTA

Make	Model	Engine	Years
VW	JETTA		1999–2005
VW	JETTA (MK4)		1999–2005

Fitment data last updated: 2026-06-29