VAG 1.8T 20V Downpipe transverse engine

By installing a larger bore downpipe backpressure in the exhaust drops which makes the turbo rev easier which means the turbo starts building pressure at lower RPM's. If during shifting the pressure drops it also builds back pressure faster. 

By only installing a larger diameter downpipe the horsepower usually rises between 15 and 20hp and torque also goes up by 25 to 30Nm. Combining a downpipe with chiptuning brings even more extra power.

For these engines there are several different model downpipes available:

Type 1(76mm diameter):

Suited for:

• Audi A3 1.8T FWD - 1997-2003
• Audi TT 1.8T FWD - 1999-2006
• Seat Leon Cupra 1.8T FWD - 2000-2006
• Skoda Octavia 1.8T FWD - 1999-2011
• Volkswagen Bora 1.8T FWD - 1999-2005
• Volkswagen Golf IV 1.8T FWD - 1998-2003

With 150, 163, 180 and 190hp with engine codes:

• AGU
• AJQ
• APP
• ARX
• ARY
• ARZ
• AUM
• AUQ

Replaces part numbers:

• 1J0254501BX
• 1J0254501CX
• 1J0254501FX
• 1J0254501GX
• 1J0254502EX
• 1J0254502GX
• 1J0254506SX
• 1J0254507GX
• 1J1253058GX
• 1J1253058KX
• 1J2253058JX
• 1J2253058MX
• 1J2253058QX
• 1J2253058RX
• 8N0253208X
• 8N0254501X

Type 2(63mm diameter):

Suited for:

• Audi A3 1.8T Quattro - 1997-2003
• Audi TT 1.8T Quattro - 1999-2006
• Seat Leon 1.8T AWD - 2000-2006
• Skoda Octavia 1.8T AWD - 2001-2011

With 150, 180, 190 and 225hp with engine codes:

• AJQ
• APP
• BVR

Replaces part numbers:

• 1J0254501BX
• 1J2253058JX
• 1J2253058QX
• 1J2253058RX

Type 3(76mm diameter):

Suited for:

• Audi A3 1.8T Quattro - 1997-2003
• Audi TT 1.8T Quattro - 1999-2006
• Seat Leon 1.8T AWD - 2000-2006
• Skoda Octavia 1.8T AWD - 2001-2011

With 150, 180, 190 and 225hp with engine codes:

• AQA
• ARX
• ARY

Replaces part numbers:

• 1J1253091AH
• 1J1253091N
• 8N1253091A

Type 4(76mm diameter):

Suited for:

• Audi A3 8L 1.8T Quattro - 1997-2003
• Audi S3 8L 1.8T Quattro - 1999-2003
• Audi TT 8N 1.8T Quattro - 1999-2005

With 150, 180, 210, 224, 225 and 240hp with engine codes:

• AMK
• APX
• APY
• AUL
• BAM

Replaces part numbers:

• 8L9253091C

A software update (chiptuning) would be advised.

This product is not intended for use on the open road.