In search of the ultimate carbon fiber closed intake for the B9 Audi S4 or Audi S5 than check out the APR air intake. Flowing 31% more than stock, this intake reduces pressure drop, & improves turbocharger efficiency. This means you can expect to see up to +19 AWHP and +20 AWFT-LBS of torque on top of a stage 1 (93 octane) tune making this a simple upgrade for more power you can feel.

The APR carbon fiber system is a full upgrade as it replaces all of the intake components from the inlet scoop all the way to the turbo inlet. This is extremely important as focusing on the airbox alone does not address the main restrictions found in the factory intake system. Simply put, APR's system flows better than stock, makes more power, puts less strain on the turbocharger, looks sexy under the hood with the gorgeous carbon fiber design, and enhances the sound of the engine.

The factory turbo inlet pipe is a big restriction point because it's small. It's common for most intake systems to only focus on the filter and airbox, but doing so only has minimal impact on performance. Additionally, upgrading the turbo inlet pipe only has minimal impact on performance if it reduces down to the factory or aftermarket intake airbox. APR solves this problem by making their pipe as large as possible from the 4" filter outlet all the way to the turbocharger inlet in one piece! This minimizes pressure drop and increases flow through the system far better than a multi-piece solutions.