Revo is increasingly finding that on many modern performance cars, the factory airbox is quite well designed and does not limit the volume of air that can be taken in by the engine at Stage 1. More often, where restrictions are to be found was in the pipework behind the airbox.Maintains OEM LookReplaces Restrictive PipeworkIncreased AirflowRevo has started offering these OEM plus intake upgrade kits instead where what is mostly replaced is the pipework from the air box back to the turbo. With the factory part being plastic, it needs convolutions in the walls (ribs) to allow it to flex. Revo replaced this pipework with a perfectly smooth one-piece silicone pipe. They were also able to better tune their pipe, again to improve flow and reduce turbulence.This gets more air to the turbo quicker, improving flow rate and reducing lag.Revo also replaces the paper filter element with a higher flowing three-stage foam filter. The three-layer oiled foam construction absorbs more dirt for longer b