Milltek Sport Audi TT RS (8S) 80mm Cat-Back Exhaust System
The Milltek Sport cat-back exhaust system for the Audi TT RS (8S) is a purpose-built upgrade designed to improve exhaust flow, sharpen throttle response, and give the TT RS a more characterful sound. Whether you want a refined daily driver or something that’s more vocal on track days, there is an option here to suit.
A cat-back system replaces everything from the catalytic converter backwards – the mid-pipe, centre section, and rear tailpipes. It is one of the most popular and straightforward exhaust upgrades available, giving a noticeable improvement in sound and feel without requiring engine management changes.
Resonated or Non-Resonated?
This system is available in two configurations, so you can choose the sound level that suits you best.
Resonated (Quieter – EC Approved): Includes a resonator – a sound-dampening chamber built into the exhaust – to take the edge off the exhaust note. The result is a noticeably sportier tone compared to the standard exhaust, but one that remains comfortable for everyday use. This version carries EC type approval, meaning it meets road noise regulations and is fully road legal.
Non-Resonated (Louder): Removes the resonator for a fuller, more aggressive exhaust note. This is the choice if you want the TT RS to sound the part – particularly at higher revs and under hard acceleration. Best suited to those who enjoy a more vocal driving experience.
Why Upgrade the Exhaust on the Audi TT RS?
The Audi TT RS 2.5 TFSI five-cylinder engine has a distinctive character all of its own – an unmistakable sound that the standard exhaust partially suppresses. The Milltek system frees up that character, giving the five-pot the voice it deserves.
Beyond sound, the 80mm pipework – larger than the factory system – allows exhaust gases to exit more freely. This helps throttle response feel sharper and more immediate. Paired with an engine tune or other bolt-on modifications, improved exhaust flow can contribute to further performance gains, though on its own the primary benefit is sound and refinement.
Constructed from T304 stainless steel, the system is built to resist corrosion and withstand long-term use both on the road and on track. Milltek Sport is a well-established UK manufacturer with a strong reputation across the Audi and VAG (Volkswagen Group) performance market.
Tailpipe Finish Options
All variants deliver the same performance and sound characteristics. The finish is a purely visual choice:
- Polished – Classic bright stainless steel finish, clean and timeless. Available as SKU: SSXAU961 (Resonated) and SKU: SSXAU963 (Non-Resonated).
- Cerakote Black – A dark matte coating for a stealthy, understated look that works particularly well on black or dark-coloured cars. Available as
Additional Information
| Weight | 36 kg |
|---|---|
| Dimensions | 120 × 74 × 28 cm |
| Brand | |
| System Options | Resonated (Quieter – EC Approved), Non-Resonated (Louder) |




