Unitronic's all new 4” Turbo Inlet Elbow for the 2.5TFSI EVO (EA855) engines, found in the 8V.2 RS3 and 8S TTRS, will give you the competitive edge to gain that extra tenth of a second on the stock turbo, while supporting the airflow demands for all of the mainstream hybrid turbos currently on the market. Made from aircraft grade cast Aluminum and featuring a fully integrated PCV recirculation artery as well as CNC-machined mounting flanges, inlet and outlets, it's the ultimate turbo inlet elbow upgrade for your car.

Designed using the latest in 3D scanning and modeling, it will fit perfectly using OEM mounting points as a direct bolt-on upgrade. Unitronic engineers worked extensively with popular aftermarket turbo manufacturers to offer four modular CNC-machined billet Aluminum compressor inlet adapter rings to support many mainstream turbo upgrade solutions currently offered on the market.

Hardware Included

• Unitronic 4" Turbo Inlet Elbow for 2.5 TFSI EVO
• 1 x Unitronic Adapter Ring (56.5 mm, 62.8 mm, 66 mm or 70 mm)
• Silicone Vacuum Line
• All Necessary Hardware Included

Adapter Ring Options

• 2.5TFSI EVO 4 inch Turbo Inlet Elbow Stock Turbo (56.5mm) Adapter Ring
• 2.5TFSI EVO 4 inch Turbo Inlet Elbow TTE625/700 (62.8mm) Adapter Ring
• 2.5TFSI EVO 4 inch Turbo Inlet Elbow SRM (66mm) Adapter Ring
• 2.5TFSI EVO 4 inch Turbo Inlet Elbow Xona 710H/780H (70mm) Adapter Ring

Related Hardware

• Unitronic 3'' Turbo Inlet Elbow for 2.5 TFSI EVO
• Unitronic MPI Injector Upgrade Kit for 2.5TFSI EVO

Airflow Variations

Using its in-house Superflow SF-1020 Flow Bench, Unitronic Engineers further validated designs to ensure that the Unitronic 4” Turbo Inlet effectively optimizes airflow in a variety of conditions. The OEM inlet yielded a peak flow rate of 581 CFM at 28” of H2O (Aq), while the Unitronic 4” Turbo Inlet Elbow achieved 744 CFM, for a gain of 28% over the OEM inlet.

Airflow Simulations

Overall product design proceeds through, not only focusing on increasing overall performance of the product, but also the small and often overlooked aspects of the product’s design and function are of utmost importance to Unitronic. With a product like this 4” Inlet, it was important for aspects such as positive crankcase ventilation (PCV) to be analyzed to ensure that the PCV system will continue to function as originally intended by Audi’s Engineers, allowing crankcase pressure to be properly ventilated, as we all know what can happen over the long term, when crankcase pressure is not properly managed. As a result, extra attention was spent to allow for a complete one-piece PCV design. In keeping consistent with the factory emissions and PCV systems, Unitronic’s fully integrated PCV routing functions as it was originally intended. A pressure plot of the PCV exit shows that it has been positioned for optimized function, aligned with the factory’s intent.

Modular Fitment

Through the elimination of upstream [pre-compressor] restrictions, Unitronic’s new 4” Turbo Inlet Elbow improves the efficiency of the factory Borg-Warner turbocharger and is compatible with many mainstream stock frame hybrid turbochargers, including The Turbo Engineers TTE700, Iroz Xona 710H & 780H, Pure Turbos, and SRM/EC GTX35, through it’s versatile, precisely CNC-machined billet Aluminium compressor inlet adapters.