Milltek Large Bore Downpipe, HJS Sports Cat, OE Cat-Back - Audi TT Mk3 TTS 2.0TFSI Quattro - SSXAU586

Milltek Large Bore Downpipe with 200-cell HJS sports catalyst for the Audi TT Mk3 TTS 2.0TFSI Quattro, 2015 to 2018, non-OPF/GPF models. This downpipe fits the OE cat-back only. It does not fit Milltek cat-back systems. The equivalent downpipe for Milltek cat-back systems is SSXAU583.

76.20mm (3.0") mandrel-bent T304L stainless steel with hand-finished welds and CNC-formed flanges. The large-bore section cuts backpressure and improves scavenging against the restrictive OEM downpipe. The 200-cell HJS sports catalyst replaces the 500 to 600 cell OEM substrate, cutting restriction while retaining a catalyst in the turbo-back path. Stage 2 ECU remap required to realize the gains.

Fitment & Compatibility

• Vehicle: Audi TT Mk3 TTS 2.0TFSI Quattro, 2015 to 2018
• Not suitable for OPF/GPF equipped vehicles
• Cat-back: fits the OE cat-back only. Does not fit Milltek cat-back systems.
• Catalyst: 200-cell HJS sports catalyst
• Bore: 76.20mm (3.0"), mandrel-bent T304L stainless steel
• Requires a Stage 2 ECU remap
• Direct fitment on OEM hangers and mounting points, no modification required

Part number SSXAU586. Choose SSXAU583 instead if the car runs Milltek cat-back systems.

Designed and manufactured in the UK with over 40 years of performance exhaust heritage. Nurburgring tested.

Specifications

• Pipe diameter: 76.2mm (3.00")
• Off-road / competition use only. Not legal for use on public roads in the US.

Fitment

• Audi > TT MK3 > 2.0 TFSI Quattro > 2014 to 2023
• Audi > TT MK3 > TTS 2.0TFSI Quattro > 2015 to 2018

• 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.