$560.00
This Untd. Performance Braided flex downpipe features 3″ tapered to 2.5″ piping to achieve horsepower gains across the entire RPM range on 2.7L Audi S4/RS4 (B5) and A6/Allroad (C5). Catalytic converter is removed to eliminate restrictions on exhaust flow.
The unique hybrid design of the inlet flanges enables direct bolt-on for stock K03 turbo, upgrade K04 turbo and custom built RS6 turbo.
Available on backorder
Step into true old-school boost power with the Untd. Performance 3”–2.5” Catless Downpipes, built for Audi’s legendary 2.7L Bi-Turbo V6. Whether you’re running upgraded K04s or RS6 turbos on your B5 S4, C5 A6, or Allroad, these catless downpipes are designed to maximize flow, eliminate restriction, and let your twin-turbo V6 rip to its full potential. Less backpressure, more sound, and all the boost — this is a must-have upgrade for any serious 2.7T build.
3″ to 2.5″ Stepped Design for Ideal Flow:
Engineered for power and fitment, these downpipes start with massive 3” piping at the turbo outlet, tapering smoothly to 2.5” for optimal exhaust velocity and easier integration with midpipes or aftermarket exhausts. This setup supports big power while retaining proper flow characteristics.
Catless, Unrestricted Performance:
No cats, no compromises. The fully catless design eliminates all flow restrictions, allowing your turbos to spool faster and harder. Perfect for high-boost K04, RS6, or hybrid turbo builds.
Built for the 2.7T Legends:
Made specifically for the Audi 2.7L Bi-Turbo platform, this setup handles heat, pressure, and power — whether you’re track racing, street boosting, or chasing dyno numbers.
Raw, Aggressive Sound:
Unleash the full symphony of your 2.7T. These downpipes deliver a raw, aggressive exhaust note with brutal turbo spool and crackles on decel. It’s the sound of old-school Audi power — no filters, no fluff.
Durable Stainless Steel Construction:
Crafted from high-grade stainless steel and TIG welded for strength, these downpipes are built to handle extreme temps and abuse. Daily or track — they’re made to perform.
Bolt-On Fitment with Aftermarket Turbos:
These downpipes are designed for K04 or RS6-style turbo setups and mate up with most aftermarket or custom exhaust systems. Perfect for full builds or those upgrading from stock.
Tune Required:
As with any catless setup, a proper ECU tune is required to avoid CELs and extract the full potential of your build.
Whether you’re chasing the perfect 2.7T sound or going all-out on your K04/RS6 build, the Untd. Performance 3”–2.5” Catless Downpipes are made to flow, boost, and scream.
Compatibility:
Audi S4 B5 (2.7L Bi-Turbo)
Audi A6 C5 (2.7L Bi-Turbo)
Audi Allroad C5 (2.7L Bi-Turbo)
(For vehicles running K04, RS6, or hybrid turbochargers)
Free the boost. Hear the turbos. Feel the rush.
