CTS Turbo BOSS650 V3 for MQB VW GTI/Golf R and Audi A3/S3

CTS Turbo is proud to our updated version 3 BOSS 650 upgrade kit for MQB platform. After numerous requests for a better BOSS kit for MQB platform, our engineers went back to the drawing board. The result is a completely redesigned version of our popular BOSS 650 kit. At the heart of our aptly named BOSS (Bolt-On Speed Solution) MQB upgrade kit is a reverse rotation Gen2 30/71 CHRA. The housing is carefully cast and machined to be compatible with any exhaust downpipe. This results in very good boost response and eliminates any possible restriction. Factory wastegate geometry is retained for easy tuning. Turbo outlet is 2.5" and it is located in the factory location, for easy compatibility with 2.5" turbo outlet pipe. Integrated wastegate actuator bracket and oil/water lines complete this kit to offer simple installation, simple tuning, and problem-free operation. Currently the BOSS turbo upgrade is only compatible with CTS Turbo intake, however, other intakes could be made to work - unfortunately, we cannot provide guidance for installing other manufacturer's intakes. You can use a CTS Turbo or other billet diverter/blow-off valve. Factory DV is compatible. NOTE: 2.5" turbo outlet pipe is required (available separately). Product contents:

• Gen2 30/71 dual ball-bearing reverse-rotation CHRA
• CTS Turbo exhaust housing for factory location
• CTS Turbo integrated wastegate actuator bracket
• CTS Turbo oil lines for factory location
• CTS Turbo water lines for factory location
• CTS Turbo 3.25" cast turbo inlet included
• Hardware required for installation

Product features:

• 650hp capable (depending on fueling and engine mods)
• Direct bolt-on without any modifications to the car
• Compatible with CTS Turbo intake or aftermarket equivalent (other brand intakes will require a different coupler)
• 2.5" turbo outlet pipe required
• Compatible with any exhaust downpipe
• Tuning available for North American fueling and for upgraded fueling from United Motorsport, COBB and Eurodyne

Fitment:

• 2015-2020 VW GTI MK7
• 2015-2020 VW Golf R Mk7
• 2015-2020 Audi A3 8V
• 2015-2020 Audi S3 8V

 

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 8 applications

A3

Make	Model	Engine	Years
AUDI	A3		2013–2020
AUDI	A3 (8V)		2013–2020

GOLF R

Make	Model	Engine	Years
VW	GOLF R		2015–2020
VW	GOLF R (MK7/7.5)		2015–2020

GTI

Make	Model	Engine	Years
VW	GTI		2015–2020
VW	GTI (MK7/7.5)		2015–2020

S3

Make	Model	Engine	Years
AUDI	S3		2018–2020
AUDI	S3 (8V)		2018–2020

Fitment data last updated: 2026-06-26