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or if you eliminate the recirculation hardline
Upgrade your BMW with our SPOOL S58 Stainless Steel Race Downpipe
The sealed carbon inlet duct draws ambient air from the factory slam panel location while also introducing an additional high-pressure feed from beneath the hood
- A5/S5/RS5 | B9 (F5)
Lightweight Construction: Aerospace grade 6061-T6 aluminum center hats reduce unsprung weight for sharper handling
Vorsprung Catless Downpipe, Audi EA825 4.0T V8 Sensor Disk or if you eliminate theBuilt for Real Power, Without the Compromises Tested and validated to deliver reliable performance without concern for premature failure. Once you move past a basic tune on the 4. 0T, you're asking a lot more from the factory cats and honestly, they just cant keep up. Weve seen it time and time again: stock converters break down under the extra heat and pressure, and when they do, the risk isnt just poor performance its engine damage. We decided to
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