Milltek Sport Audi RS4/RS5 B9 2.9 V6 Turbo Avant (OPF/GPF) Hi-Flow Sports Cats

Milltek Sport's Hi-Flow Sports Cats for the Audi RS4/RS5 (B9) 2.9 V6 Turbo Avant, OPF/GPF Models, replace the restrictive factory catalytic converters with genuinely higher-flow metal substrate units, delivering improved flow while retaining meaningful emissions control, unlike a full de-cat pipe. Constructed from T-304 stainless steel throughout, these sports cats are built to outlast the factory components they replace, resisting the corrosion that eventually catches up with mild steel factory parts.

Unlike a full de-cat pipe, this configuration retains genuine catalytic converter function, a sensible choice for owners wanting improved flow while staying closer to emissions compliance than a straight-through pipe. Reducing restriction at the catalytic converter stage is one of the more meaningful upgrades available on this twin-turbo V6 platform, letting the engine breathe more freely without stepping into full de-cat territory.

Why Choose These Hi-Flow Sports Cats

• Genuinely higher flow capacity than the restrictive factory catalytic converters
• Retains meaningful catalytic converter function, unlike a full de-cat pipe
• T-304 stainless steel construction, built for long-term durability
• Specifically engineered for OPF/GPF-equipped models

Compatibility

• Audi RS4 (B9) 2.9 V6 Turbo Avant, OPF/GPF Models
• Audi RS5 (B9) 2.9 V6 Turbo, OPF/GPF Models