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Home > Downpipe Exhaust for 1999-2006 Audi S3 TT 1.8T 3 Inch High Flow | SPELAB
SPELAB catless downpipe kit for 1999-2006 Audi S3 TT 1.8T turbo, showing 3 inch mandrel-bent stainless pipes, braided flex, V-band clamp, gaskets, and hardware beside the branded box.
Two-piece 3 inch catless downpipe set for 1999-2006 Audi S3 TT 1.8T turbo, polished T-304 stainless with 4-bolt turbo flange, woven flex, V-band, plus gaskets and bolts.
Assembled front section of a 3 inch catless downpipe for 1999-2006 Audi S3 TT 1.8T turbo, mirror-polished stainless with 4-bolt flange, woven flex joint, and V-band clamp.
Rear mandrel-bent pipe of a 3 inch catless downpipe for 1999-2006 Audi S3 TT 1.8T turbo, TIG-welded T-304 stainless with CNC chrome flange and welded O2 bung.
Complete 3 inch catless downpipe kit for 1999-2006 Audi S3 TT 1.8T turbo, showing the flex V-band front pipe, polished rear pipe, composite gaskets, and mounting hardware.
Stainless mounting hardware for a 3 inch catless downpipe on 1999-2006 Audi S3 TT 1.8T turbo, with hex bolts, flange nuts, and flat washers for the 4-bolt and V-band flanges.
SPELAB catless downpipe kit for 1999-2006 Audi S3 TT 1.8T turbo, showing 3 inch mandrel-bent stainless pipes, braided flex, V-band clamp, gaskets, and hardware beside the branded box.
Two-piece 3 inch catless downpipe set for 1999-2006 Audi S3 TT 1.8T turbo, polished T-304 stainless with 4-bolt turbo flange, woven flex, V-band, plus gaskets and bolts.
Assembled front section of a 3 inch catless downpipe for 1999-2006 Audi S3 TT 1.8T turbo, mirror-polished stainless with 4-bolt flange, woven flex joint, and V-band clamp.
Rear mandrel-bent pipe of a 3 inch catless downpipe for 1999-2006 Audi S3 TT 1.8T turbo, TIG-welded T-304 stainless with CNC chrome flange and welded O2 bung.
Complete 3 inch catless downpipe kit for 1999-2006 Audi S3 TT 1.8T turbo, showing the flex V-band front pipe, polished rear pipe, composite gaskets, and mounting hardware.
Stainless mounting hardware for a 3 inch catless downpipe on 1999-2006 Audi S3 TT 1.8T turbo, with hex bolts, flange nuts, and flat washers for the 4-bolt and V-band flanges.

Downpipe Exhaust for 1999-2006 Audi S3 TT 1.8T 3 Inch High Flow | SPELAB

$189.00
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Description Installation Guide FAQ Shipping & Returns

This Catless Audi 1.8T I4 Turbo (AWP / BAM / APY / APX etc.) downpipe replaces the restrictive factory downpipes and removes the catalytic converter for maximum flow. Engineered for Audi, it’s a direct bolt-on upgrade that delivers stronger mid-range torque, faster turbo spool, and a more aggressive exhaust note.

Who This Is For

1999-2006 Audi S3 and Audi TT owners with the 1.8T turbo engine who want a 3" high-flow downpipe for maximum turbo response and a more aggressive exhaust note.

Key Features

  • 3" high-flow design for maximum exhaust flow
  • 16-gauge T-304 stainless steel with computerized mandrel bends
  • TIG-welded joints and CNC machine flange
  • Chrome-plated flanges for corrosion resistance
  • Direct bolt-on to factory turbocharger

Product Specifications

  • Engine: Audi 1.8T I4 Turbo (AWP / BAM / APY / APX / etc.)
  • Pipe Diameter: 3 inch
  • Material: 16-gauge T-304 Stainless Steel
  • Surface: Mirror Polish
  • Configuration: Catless
  • Flange Type: Bolt-on (4-Bolt) + V-Band clamp
  • Certificate: ISO9001:2000
  • Weight: 7.60 kg (7600 g)

What's Included

  • Downpipe
  • Gasket(s)
  • V-Band clamp(s)
  • Mounting hardware

Check Before Choosing

  • Engine code: Fits 1.8T I4 DOHC turbo engines. Verifies engine code (AWP, BAM, APY, APX) before ordering.
  • Tune required: Yes — a Stage 2 tune is required to clear CEL and realize the full power gain.
  • S3 vs TT: Both S3 and TT 1.8T models share the same turbo/downpipe geometry. Verifies chassis details before ordering.
  • Street legality: No — off-road / race use only.

Vehicle Fitment

Compatible vehicles: Audi S3 1.8T and Audi TT 1.8T (1999–2006).

Year Make Model Engine Chassis
1999 Audi S3 1.8T 1.8T I4 8L
2000 Audi S3 1.8T 1.8T I4 8L
2001 Audi S3 1.8T 1.8T I4 8L
2002 Audi S3 1.8T 1.8T I4 8L
2003 Audi S3 1.8T 1.8T I4 8L
1999 Audi TT 1.8T 1.8T I4 8N
2000 Audi TT 1.8T 1.8T I4 8N
2001 Audi TT 1.8T 1.8T I4 8N
2002 Audi TT 1.8T 1.8T I4 8N
2003 Audi TT 1.8T 1.8T I4 8N
2004 Audi TT 1.8T 1.8T I4 8N
2005 Audi TT 1.8T 1.8T I4 8N
2006 Audi TT 1.8T 1.8T I4 8N