Milltek Large Bore Downpipe Hi-Flow Sports Cat - VW Golf MK4 GTI - SSXVW393
Ships free in the US
- Shop tested in Dallas
- Free pickup in Dallas
- Installs at our shop
The Milltek 3" Large Bore Downpipe with integrated Hi-Flow Sports Catalyst is engineered for VAG 1.8T platforms (Audi A3, VW Golf Mk4 GTI, Seat Leon, Skoda Octavia RS, and others). This component pairs with OEM or Milltek cat-back exhaust systems to unlock flow gains across the entire exhaust path. T304L stainless steel construction with mandrel-bent piping ensures durability and precise flow dynamics.
The hi-flow catalyst maintains emissions compliance while minimizing backpressure — dyno-proven gains in mid-range torque and top-end power without sacrificing reliability. Direct factory fitment uses OEM hangers and mounting points; no modification required. Stage 2+ ECU software typically required to realize full potential. Decibel-tested for street and circuit use.
Vehicle Fitment:
- Audi A3 1.8T 2WD (2000-2005, 3 & 5 door)
- Seat Leon 1.8T Sport & Cupra 180PS (2000–2005)
- Skoda Octavia RS 1.8T 180 & 150 (2000-2005)
- Volkswagen Bora 1.8T 2WD (2000–2005)
- Volkswagen Golf Mk4 GTI 1.8T (2000-2005)
- Volkswagen Golf Mk4 337 Anniversary 180 bhp (2002–2004)
- Volkswagen Jetta Mk4 1.8T 2WD (1999–2005)
Technical Specs: Bore: 76.2 mm (3"); Material: T304L stainless steel; Integration: OEM cat-back or Milltek cat-back (selection required at purchase).
Hand-finished construction and rigorous dyno testing distinguish Milltek systems from universal-fit alternatives.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Specifications
- Pipe diameter: 76.2mm (3.00")
- Fitting time: 1 to 1.5 hours, including removing the factory system
- Off-road / competition use only. Not legal for use on public roads in the US.
Fitment
- Seat > Leon > 1.8T Sport and Cupra > 2000 to 2005
- Volkswagen > Golf > MK4 1.8T 2WD > 1998 to 2004
- Volkswagen > Golf > MK4 337 Anniversary > 2002 to 2004
- Volkswagen > Golf > MK4 GTI 1.8T > 1998 to 2004
- Volkswagen > Jetta > MK4 1.8T 2WD > 1999 to 2005
- Free US shipping on orders over $250.
- Free pickup at our Dallas shop, usually ready within 24 hours.
- Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
- Want it installed? Book the install at thegbmotors.com.
Full details are on our shipping and returns page.
More for your build
Shop pickBMW G20 M340i & G22 M440i - Cat-Back Quad with GT-100 Black Tips
Milltek Downpipe and Cat - Audi TT Mk2 2.0 TFSi 2WD - SSXAU348
Milltek Resonated Valved GPF-Back Exhaust - Land Rover Defender 130 V8 - Polished Tips - SSXLR239
