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Home > Downpipe Exhaust for 1997-2005 Audi A4 B5 B6/VW Passat 1.8T/L J2 Engineering
SPELAB catless downpipe kit for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, shown with box, two gaskets, and bolts in a 2.5-inch inlet to 3-inch outlet stainless design.
2.5-inch catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, pictured beside an Audi sedan to show fitment with smooth-flow stainless tubing.
Polished 304 stainless catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, with rust-resistant, heat-tolerant tubing and a machined flange bore.
TIG-welded catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, close-ups showing durable joints, O2 bungs, and a crack-resistant flange bore.
Bolt-on catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, install steps over a Passat outline showing flange, gaskets, and hardware with no modification.
Advanced-welded catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, four close-ups of TIG seams, bung welds, and open stainless bores.
Catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo with two gaskets and six bolts, a 2.5-inch inlet flange and V-band 3-inch outlet in stainless.
Mirror-polished catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, mandrel-bent 2.5-inch inlet to 3-inch outlet with twin O2 bungs and TIG welds.
Stainless catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, angled view of the flanged inlet, V-band outlet, and dual O2 sensor bungs.
Close-up of the 2.5-inch inlet flange on a catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, showing the CNC-machined face, bolt holes, and polished bore.
Machined chrome flange detail on a catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, with a clean bore and TIG weld at the stainless tube.
SPELAB catless downpipe kit for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, shown with box, two gaskets, and bolts in a 2.5-inch inlet to 3-inch outlet stainless design.
2.5-inch catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, pictured beside an Audi sedan to show fitment with smooth-flow stainless tubing.
Polished 304 stainless catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, with rust-resistant, heat-tolerant tubing and a machined flange bore.
TIG-welded catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, close-ups showing durable joints, O2 bungs, and a crack-resistant flange bore.
Bolt-on catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, install steps over a Passat outline showing flange, gaskets, and hardware with no modification.
Advanced-welded catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, four close-ups of TIG seams, bung welds, and open stainless bores.
Catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo with two gaskets and six bolts, a 2.5-inch inlet flange and V-band 3-inch outlet in stainless.
Mirror-polished catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, mandrel-bent 2.5-inch inlet to 3-inch outlet with twin O2 bungs and TIG welds.
Stainless catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, angled view of the flanged inlet, V-band outlet, and dual O2 sensor bungs.
Close-up of the 2.5-inch inlet flange on a catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, showing the CNC-machined face, bolt holes, and polished bore.
Machined chrome flange detail on a catless downpipe for 1997-2005 Audi A4 B5 B6 and VW Passat 1.8T turbo, with a clean bore and TIG weld at the stainless tube.

Downpipe Exhaust for 1997-2005 Audi A4 B5 B6/VW Passat 1.8T/L J2 Engineering

$89.00
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Description Installation Guide FAQ Shipping & Returns

This Catless 1.8T downpipe replaces the restrictive factory downpipes and removes the catalytic converter for maximum flow. Engineered for Audi & VW, 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

1997-2005 Audi A4 (B5/B6) and VW Passat 1.8T owners who want a 2.5"→3" downpipe for the turbocharged 1.8L 1.8T I4 engine.

Key Features

  • 2.5" inlet to 3" outlet for optimal flow
  • Up to 10-15 HP gain
  • 16-gauge T-304 stainless steel with mandrel bends
  • TIG-welded joints and CNC machine flange
  • Chrome-plated flanges for corrosion resistance

Product Specifications

  • Engine: Audi / VW 1.8L 1.8T I4 DOHC Turbo
  • Inlet Size: 2.5 inch
  • Outlet Size: 3 inch
  • Power Increase: Up to 10-15 HP
  • Material: 16-gauge T-304 Stainless Steel
  • Surface: Mirror Polish
  • Configuration: Catless
  • Flange Type: V-Band
  • Certificate: ISO9001:2000
  • Weight: 2.50 kg (2500 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 (AEB, ATW, AUG, etc.) before ordering.
  • Tune required: Yes — a Stage 2 tune is recommended to clear CEL and realize full power.
  • Power claim: "Up to 10-15 HP" — actual results depend on supporting mods and tune.
  • Street legality: No — off-road / race use only.

Vehicle Fitment

Compatible vehicles: Audi A4 B5, Audi A4 B6, and VW Passat 1.8T (1997–2005).

Year Make Model Engine Chassis
1997 Audi / VW A4 B5 / Passat 1.8T 1.8T I4 B5
1998 Audi / VW A4 B5 / Passat 1.8T 1.8T I4 B5
1999 Audi / VW A4 B5 / Passat 1.8T 1.8T I4 B5
2000 Audi / VW A4 B5 / Passat 1.8T 1.8T I4 B5
2001 Audi / VW A4 B5 / Passat 1.8T 1.8T I4 B5
2002 Audi / VW A4 B6 / Passat 1.8T 1.8T I4 B5 / B6
2003 Audi / VW A4 B6 / Passat 1.8T 1.8T I4 B5 / B6
2004 Audi / VW A4 B6 / Passat 1.8T 1.8T I4 B5 / B6
2005 Audi / VW A4 B6 / Passat 1.8T 1.8T I4 B5 / B6