Vorsprung High-Flow Catted Downpipe, Audi 4M SQ7, SQ8, RSQ8 EA825 4.0T V8

Built for Real Power, Without the Compromises - These catalysts are designed, tested, and validated to deliver reliable performance without concern for premature failure.

This is the catted version of this downpipe — factory-style catalytic converters stay in place (200-cell or 400-cell metallic), so you get a big flow and power increase without the check-engine-light headaches or off-road-only status of a catless setup. Want maximum flow with the cats removed entirely? See our Catless Downpipe instead.

Once you move past a basic tune setup on the Audi 4.0T, you're asking a lot more from the factory cats, and honestly, they just can’t keep up. We’ve seen it time and time again: stock converters break down under the extra heat and pressure, and when they do, the risk isn’t just poor performance; it’s engine damage.

Whether you’re looking to maximize performance on a heavily tuned build or simply craving a richer, more aggressive exhaust note from your factory setup, these high-flow catalysts deliver exactly what you need. By dramatically reducing backpressure compared to restrictive stock units, they unlock hidden horsepower and sharper throttle response for drivers pushing the limits, while instantly waking up the sound profile for those staying on the stock tune. It’s the perfect foundational upgrade to transform your vehicle's character, giving you the volume, spool, and performance you want without compromising on reliability.

Precision Catalysts: 200-Cell & 400-Cell Metallic Options

Why Metallic Substrates? Because Balance Matters.

Everyone loves the sound of a performance exhaust until the drone and fumes from cheap test pipes make your car feel like a straight-piped lawnmower. That is why we have engineered a solution offering two distinct paths to performance, both utilizing advanced metallic catalyst technology.

We know other downpipes look the same, but the catalyst is the heart of a good downpipe. That's why we prioritized the catalyst first. Even with 200-cell High-Flow catalysts, our customers report no smell.

Whether you choose our 200-cell High-Flow or our 400-cell Ultra-Efficiency options, you are getting a substrate we validated closely with our manufacturer to withstand the extreme thermal and mechanical loads of the 4.0 platform. Unlike the fragile ceramic cores used by budget brands to boost profits, our metallic substrates are engineered to survive sustained heat cycles and aggressive driving without crumbling.

The Choice is Yours:

• 200-Cell Metallic: The enthusiast’s choice for maximum auditory feedback and the least amount of back pressure. It strikes the perfect balance: dense enough to smooth out noise and harsh odors, yet open enough to support serious horsepower.

• 400-Cell Metallic: The ideal solution for drivers prioritizing maximum filtration and stealth. We have sourced a modern, high-flow 400-cell design that sheds the restrictive reputation of older GESI units, offering enhanced durability and flow characteristics that do not choke the engine.

Both configurations are engineered to meet Euro 6 and EPA compliance specifications, ensuring that you get the performance you paid for without the headaches. By sourcing the highest-quality non-branded metallic cats available, we provide a setup that ensures no noxious smells and rock-solid reliability, all without the inflated "brand tax" price tag.

Engineered for Endurance, Guaranteed for Life

We understand that a lifetime warranty offers little value if you're frequently dealing with the inconvenience and expense of part replacement and re-installation labor. At Vorsprung Autowerk, our focus isn't just on warranty duration; it's on product longevity and reliability.

We chose our materials and design specifically to eliminate the common failure cycle of 12-24 months. Our components are built right the first time to stay on your vehicle.

Performance, Reliability, and Thoughtful Design

• Full flow path from top to bottom, with no tapering down to OEM size
• Detachable flanges to make installation a breeze
• Smooth transition to OEM-style lower flanges for easy fitment
• Vorsprung reinforced flange design
  
• Precision TIG-welded and back-purged for maximum strength
• Double-walled pipe ends to resist cracking over time
• Extra-thick 10mm stainless flanges, reinforced inside and out to prevent warping and treated for an ultra-smooth mating surface
• Heat shielding included to control temps, reduce heat soak, and protect nearby components
• 304L stainless steel construction (Vorsprung Spec 2.0mm wall thickness) throughout, built to last

We’re currently beta testing emissions compliance in states where exhaust emissions are tested, so far, everything is running clean. These converters are rated to withstand temps well beyond what the 4.0T can throw at them.

Please note: These are currently made to order. Delivery times are approximately 30 days.

High-Flow Catted Downpipe FAQ

What's the difference between this and the Catless Downpipe?
This version keeps the catalytic converters in place (200-cell or 400-cell metallic), so you get a flow and power increase while keeping a fuller, more street-oriented setup than a fully catless downpipe. See our Catless Downpipe if you want maximum flow with the cats removed entirely.

200-cell or 400-cell, which should I choose?
200-cell metallic is the enthusiast's choice for maximum flow and the least backpressure. 400-cell metallic prioritizes filtration and a more stock-like, stealthy sound. Both use the same metallic substrate engineered for the 4.0T platform.

How long is the lead time?
These are currently made to order, with delivery times of approximately 30 days.

What's the warranty?
Lifetime Warranty, we build these to eliminate the common 12-24 month failure cycle other cats see on this platform.