AWE Catback + Milltek Downpipes

[Bkitch89]

Does anyone know if you can pair the AWE Catback exhaust with the Milltek Downpipes on a 2015 S7?

[Kem]

Not without some customization. Technically the cats are not part of the downpipe like on older audis. In the photo the section with the flex pipe is the downpipe.

Technically the AWE and Milltek cat-backs come with downpipes since the cat pipes are in the engine bay. These cat-backs are made to mount up to the stock cat-pipes which are a smaller diameter.

The milltek catless pipes and hfc pipes are a larger diameter, so if they mount to the regular cat-back systems they would have to reduce diameter, which wouldnt make sense. So when you buy them you get new downpipes without the restriction, so essentially you get a replacement part for a pipe you already have. if you look in the second photo the milltek cat delete pipes come with new flex joint sections.

So to mate it to the AWE system you'd have to cut the awe system and do some welding, or figure out a way to mate the new milltek downpipe to the awe system. Either way I'd venture to guess it would require welding.

Unitronic is making some cat-less pipes that will mate to the stock and awe systems.