The Ultimate Intake System for the 4.0T EA825 V8 SUV Engine Our 4.0T EA825 V8 Intake System for SUV models offers an OEM+ appearance upgrade with an intake plenum (the air chamber prior to the engine's cylinders) in a stunning matte forged carbon finish that enhances airflow by up to 22% compared to stock. The enhanced turbocharger inlets feature a bell mouth profile that directly connects to the factory turbocharger, promoting optimal flow and facilitating easy upgrades to future turbos. The system incorporates a proprietary performance intake filter with a high-flow cotton gauze filtration material and a flow-bench optimized design that significantly improves airflow through the system and into the intake plenum. This filter surpasses stock performance by up to 12% and reduces pressure drop at the same flow rates, alleviating the turbochargers’ strain and maximizing overall performance. Additionally, it sharpens throttle and turbocharger response, resulting in a more responsive driving experience. This intake system is the pinnacle of performance for the 4.0T EA825 V8 engine, powering SQ7, SQ8, RSQ8, Bentley Bentayga, Porsche Cayenne, and Lamborghini Urus. The Design The 4.0T SUV’s engine bay design is compact. The factory employs a dual inlet design that feeds into an airbox positioned beneath the intake filter cover, which then feeds into a multi-part turbocharger plenum. Airflow is directed 180 degrees into turbo inlet adapters and both turbochargers. The intake filter underwent optimization on the flow bench to maximize airflow while utilizing a filter media that provided adequate filtration and extended filter life. Through several design revisions verified on the flow bench, we increased CFM by up to 12% over the stock unit! The overall shape and design of the filter resemble the factory unit due to its location, but it internally features several enhancements to enhance airflow beyond simply changing filter media. Next, the turbocharger plenum was upgraded. The factory plenum is small and features a flow-restricting split-body design. We eliminated this and replaced it with a large, organically shaped single-body design to promote airflow. Forged Carbon fiber was used not only for its aesthetic appeal but also because it allows for thin walls and complex geometry to maximize cross-sectional area. This aids in airflow and reduces pressure drop. The APR plenum is significantly larger than the factory unit in various areas and is a single-piece design that extends past the integrated PCV and EVAP bungs and runs all the way down to the new billet aluminum high-flow turbocharger inlets - less restriction, more airflow to the engine. The billet aluminum turbocharger inlets feature a bell-mouth profile to promote airflow. If upgrading to larger turbochargers, the inlets can be modified or replaced to match the compressor cover on the new turbochargers. Furthermore, this system integrates PCV and EVAP bungs for a seamless installation. New EVAP jet pumps were designed and supplied for proper emission control despite all this power increase. All these improvements result in an upgrade that’s worthy of the 4.0T’s engine bay. The intake system allows the engine to breathe more freely, maximizing performance and giving a subtle but enhanced burliness to the engine note that’s sure to delight the discerning ear.