Flashark 2.4" Stainless Steel Downpipe Exhaust for 2010-2016 Audi S4 B8/B8.5 3.0T V6

The EA837 3.0T supercharged V6 is one of Audi's most tunable platforms — but the factory downpipes are the single largest bottleneck holding it back. From the factory, each bank routes exhaust through a tightly wound catalytic converter with a crush-bent neck-down that restricts flow to roughly 2.1 inches at the choke point. That restriction creates backpressure that slows the supercharger's response, caps midrange torque output, and puts a hard ceiling on what your ECU tuner can safely extract.

This Flashark 2.4-inch catless downpipe set replaces both the left and right factory downpipes from the factory flange to the cat-back connection. Each pipe is constructed from stainless steel with precision mandrel bends that maintain full internal diameter through every curve — no crimps, no neck-downs, no turbulence pockets. The silver stainless finish provides lasting corrosion resistance against road salt, moisture, and thermal cycling without the premium markup of polished tubing.

The result is immediate and noticeable: the supercharger builds boost faster from a stop, midrange torque from 2,500 RPM to redline gains a punch that the stock pipes simply choke off, and the exhaust note opens up, letting that supercharged V6 sound like the performance engine it is. When paired with a Stage 2 tune from APR, Integrated Engineering, 034Motorsport, or JHM, expect 30–50 AWHP and 40–60 lb-ft of torque over a Stage 1 flash alone.

This is a race-inspired performance part. It removes factory catalytic converters and requires a Stage 2 ECU tune to operate without diagnostic codes. For off-road and competition use only — check your local regulations before purchasing.

Built from high-quality stainless steel with precision TIG welding, these downpipes are engineered for a true bolt-on installation. Each set comes complete with all necessary clamps, gaskets, and hardware — no cutting, no welding, no fabrication required.

Whether you're building a track weapon or upgrading for enhanced daily driving performance, these downpipes are the single most impactful upgrade for the 3.0T V6 platform.

Key Features

2.4" Mandrel-Bent Stainless Steel Tubing — Full 2.4-inch inner diameter from flange to outlet on both left and right pipes. Smooth mandrel bends eliminate the crush-bent restrictions found on the factory downpipes, delivering measurably faster exhaust gas velocity and reduced backpressure across the entire RPM range

Catless Design (Race-Off-Road) — Removes the factory catalytic converters entirely on both banks. The OEM cats are the single largest flow restriction in the 3.0T exhaust system — eliminating them drops backpressure significantly, which directly translates to faster boost response, stronger midrange torque, and higher peak horsepower with a proper Stage 2 tune

Pre-Welded O2 Sensor Bungs — Both downstream oxygen sensor mounting points are pre-welded to the pipes for plug-and-play factory-sensor installation. No welding, no drilling, no guessing sensor placement — thread in your factory O2 sensors and connect

Precision TIG Welding — Every joint is TIG-welded for full penetration and long-term durability at extreme exhaust temperatures. No MIG tack welds, no weak points that crack after thermal cycling — built to withstand repeated heat cycles from daily-driven and track-use vehicles alike

CNC-Machined Flanges — Computer-numerically-controlled machined flanges on every connection point deliver flat, leak-free sealing surfaces. No warped castings, no gasket creep — bolt it on once and it stays sealed

Complete Hardware Kit Included — Every clamp, gasket, bolt, and nut required for installation is in the box. Stainless steel exhaust clamps, multi-layer gaskets, and M10 grade hardware — no trips to the hardware store

Left & Right Pair (Complete Set) — Both driver-side and passenger-side downpipes included. The EA837 3.0T V6 has two independent exhaust banks with separate factory cats — replacing both simultaneously is essential for balanced flow and consistent performance gains

Silver Stainless Finish — Professional silver stainless steel finish resists the corrosive combination of road salt, moisture, and thermal cycling that causes mild steel and aluminized pipes to rust through within two winters. No painted coatings to peel or blister under heat cycling — solid stainless through and through

Why Go Catless?

The factory catalytic converters on the Audi 3.0T V6 are the single biggest flow restriction in the exhaust system. These cats are designed for emissions compliance, not performance — they create significant backpressure that chokes your engine's breathing ability.

Swapping them out with high-flow catless downpipes opens up the path for exhaust gases to exit faster and more efficiently. The result:

• Faster turbo spool — reduced backpressure means turbos reach boost pressure quicker
• Stronger mid-range torque — feel the pull from 2,500 RPM to redline
• More aggressive exhaust note — the supercharged V6 sounds incredible with free-flowing exhaust
• Improved top-end power — less restriction = more horsepower up top
• Better throttle response — sharper, more immediate acceleration

Whether you're chasing lap times on track days or building a weekend performance sedan, catless downpipes are the #1 bolt-on upgrade for the 3.0T V6 platform.

Pro Tip: For maximum gains and to eliminate Check Engine Lights, pair these downpipes with a performance tune from APR, Integrated Engineering (IE), 034Motorsport, or JHM.