Milltek Secondary Catalyst Delete Pipe - Audi Dual-Cat Systems - SSXAU226

The Milltek Secondary Catalyst Delete Pipe removes the secondary catalyst from dual-pipe exhaust assemblies, improving gas flow and reducing flow restrictions in the exhaust system. Direct fitment to Milltek cat-back systems and compatible with OEM cat-back assemblies on applicable Audi models.

Constructed from T304L stainless steel with mandrel-bent tubing, this secondary cat bypass is engineered to work alongside existing primary catalyst systems. Hand-finished construction ensures OEM+ fitment and durability. No modification required for installation.

Fitment:

• Compatible with Milltek cat-back exhaust systems on dual-catalyst Audi models
• Works with OEM factory cat-back systems where secondary catalyst removal is desired
• Direct bolt-on fitment—no welding or cutting required

T304L stainless construction with precision mandrel bending delivers lasting durability and measurable flow improvements over secondary catalyst restrictions.

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

Specifications

• Pipe diameter: 63.5mm (2.50")
• 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

• Audi > TT MK2 > TT RS Coupe 2.5-litre TFSI quattro > 2009 to 2014
• Audi > TT MK2 > TT RS Roadster 2.5-litre TFSI quattro > 2009 to 2014

• 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.