The Milltek cat-back for the Audi S1
The S1 cat-back comes resonated, for a quieter cabin and less motorway drone, or non-resonated for more volume. Tips are offered as oval outlets or GT-90 round tips, each in polished or Cerakote black; see Milltek exhaust tip styles.
Which downpipe suits your S1?
The sports cat downpipe and the HJS Tuning ECE downpipe both keep a catalyst, so they suit a car used on the road. The de-cat downpipe has no catalyst: it is for off-road and competition use only and will fail an MOT emissions test. All three usually need an ECU remap. Parts for the 1.4 TFSI and 40 TFSI are on the Audi A1 page.
Buying S1 parts from Milltek Exhaust Shop
Use the vehicle lookup above to confirm fitment against your registration. We deliver free across the UK and ship overseas, with PayPal and Klarna at checkout, and our Stoke-on-Trent workshop can do the fitting.