The APR T2100004 K-04 kit includes a Borg-Warner K04 turbo, the compressor inlet O-ring, three turbo to downpipe studs, one manifold to turbo gasket, and one turbo to cat gasket. This kit also includes the APR K-04 chip programming for the Audi B6 A4 1.8T (a $699 value!). This kit is a straight forward turbo swap that makes a big difference in the power output of the car.
The APR K-04 kit makes solid gains in both horsepower and torque. With no other mods than a full exhaust, the kit made 247hp/286lb-ft on 93 octane gas. Although an exhaust is not required, it is highly recommended.
The software for this kit is also available separately for current APR Stage I/I+ or II/II+ customers for $199 or $699 for customers that do not currently have an APR tune on their car.
APR T2100004 Vehicle Fitment:
2002 Audi A4 1.8T
2003 Audi A4 1.8T
2004 Audi A4 1.8T
2005 Audi A4 1.8T
2005.5 Audi A4 1.8T
This kit requires Audi TT 225 injectors and a High flow catalytic converter. The APR T2100003 kit comes with the reqired injectors.