Original Audi TT and Mk2 TT: what fits
For the 1998 to 2006 TT there are cat-back systems for the 150 and 180 front-wheel-drive cars, the 180 and 225 quattro and the 3.2 V6 quattro, plus sports cat and de-cat downpipes for the 180 and 225 quattro.
The Mk2 range covers the 2.0 TFSI front-wheel drive from 2006 to 2011 with a cat-back and downpipes, the 3.2 quattro from 2006 to 2010 with a cat-back, and the TTS quattro from 2008 to 2014 with a cat-back, a de-cat downpipe and cast downpipes in HJS sports cat or Race cat form.
Mk2 TT RS: Coupe or Roadster?
The 2009 to 2014 TT RS 2.5 TFSI has separate listings for the Coupe and the Roadster, so choose the body style first. Each has a cat-back, a turbo-back system with a sports cat, a turbo-back system with no cat and a secondary catalyst bypass. The sports cat turbo-back keeps a catalyst. The no-cat turbo-back and the secondary catalyst bypass are for off-road and competition use only and will fail an MOT emissions test. The RS3 range covers more 2.5 TFSI cars.
Mk3 TTS and TT RS: OPF/GPF or not?
Mk3 parts are split by particulate filter. The TTS 2.0 TFSI is listed as non-OPF for 2015 to 2018 and OPF/GPF from 2019; the TT RS 2.5 TFSI as non-OPF from 2016 and OPF/GPF from 2019. Cat-back systems are listed for all four, and the 2019-on TT RS also has a filter-back that keeps the filter in place.
Downpipes include sports cat, HJS Tuning ECE (non-OPF TT RS and OPF TTS), cast Race cat (non-OPF TTS) and de-cat versions, plus a secondary catalyst bypass for the non-OPF TT RS. The TT RS has Active Valve Control for both versions. The non-OPF TTS also gets a Road+ centre silencer.
Sound, tips and road use on the TT
Many TT systems come resonated (quieter, with less drone at cruising speed) or non-resonated, and some listings add Race resonated and non-resonated versions, which are louder and motorsport-oriented. Tips range from JET-90 and GT-100 rounds to GT-115 and RS-style ovals in polished, Cerakote black, titanium, brushed titanium, burnt titanium and carbon fibre: see our tip styles page.
Sports cat and HJS ECE downpipes keep a catalyst, while de-cat downpipes are off-road and competition only and will fail an MOT emissions test. Race cat downpipes are a louder, motorsport-oriented choice. Most downpipes need an ECU remap; browse manifolds, de-cats and sports cats for more.
Buying for your TT from Milltek Exhaust Shop
With so many TT variants, the reg lookup at the top of the page is the quickest way to see the parts for your car. UK delivery is free, we ship worldwide, and you can pay with Klarna or PayPal. Our Stoke-on-Trent workshop can fit anything from a cat-back to a full turbo-back.