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Milltek Race Large Bore Downpipe & Hi-Flow Sports Cat for Audi TT MK1 225 Quattro
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Milltek Race Large Bore Downpipe & Hi-Flow Sports Cat for Audi TT MK1 225 Quattro

Milltek
MILSSXAU431
Downpipes
$1,243.34
Important Fitment Note For use only with the Milltek 3-inch Race System. Requires Stage 2 ECU...
$1,243.34

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Milltek Race Large Bore Downpipe & Hi-Flow Sports Cat for Audi TT MK1 225 Quattro

Important Fitment Note

  • For use only with the Milltek 3-inch Race System.
  • Requires Stage 2 ECU remap.
  • Fits 225 model only. Possible clearance issues on Roadster due to additional bracing.

Milltek Race Large Bore Downpipe and Hi-Flow Sports Cat for the Audi TT MK1 225 Quattro

A 3-inch large bore downpipe with a 200 CPSI hi-flow sports catalyst, built to pair with the Milltek 3-inch Race Cat-Back on the TT MK1 1.8T 225 Quattro (1998 to 2006). It reduces restriction after the turbo for stronger power and torque once the car is mapped to Stage 2.

Key Features

  • Large bore flow: 3-inch (76.20mm) pipework from the turbo back.
  • Hi-flow sports catalyst: 200 CPSI (cells per square inch) cat in place of the restrictive OE unit.
  • Race product: designed for use with the Milltek 3-inch Race Cat-Back and a Stage 2 ECU remap.
  • Built to last: T304L stainless steel construction.

Technical Specifications

  • Material: T304L stainless steel
  • Pipe Diameter: 3.0" (76.20mm)
  • Catalyst: 200 CPSI hi-flow sports catalyst
  • Kit contents: large bore downpipe assembly (MSAU607) and hi-flow sports catalyst (MSAU608)

Fitment

  • Fits: Audi TT MK1 1.8T 225 Quattro Coupe, 1998 to 2006.
  • Roadster: possible clearance issues due to additional bracing.
  • Does not fit the TT MK1 150 or 180 models.
  • Does not fit the OE cat-back or non-race Milltek cat-backs. Use with the Milltek 3-inch Race Cat-Back only.

Why Choose Milltek?

With decades of experience in performance exhaust systems, Milltek is a trusted name among automotive enthusiasts, and every system is engineered for precise fit and consistent performance.

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Vehicle fitment

  • 2000-2006 Audi TT Quattro Base
  • 2002 Audi TT Quattro ALMS Edition
  • 2006 Audi TT Quattro Special Edition
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