33R Carbon intakes offer improved airflow, sound, and power by replacing restrictive factory parts with larger, smoother tubing (often 3.5"), high-flow filters (like inverted cones), and often CNC-machined turbo adapters for better turbo spool and response, with some systems featuring front-mount designs for max cold air. Key features to look for are carbon fiber or aluminum piping, enclosed or open-top designs, and easy installation, with many promising significant horsepower gains.