At 57.70mm in diameter, the 034Motorsport CREC 3.0 TFSI Supercharger Pulley is significantly smaller than the factory unit in order to increase the drive ratio of the supercharger. Spinning the supercharger faster yields increased boost pressure throughout the RPM range, resulting in increased horsepower and torque throughout the powerband when paired with Stage 2 or Stage 2+ Performance Software.034Motorsport's Supercharger Pulley Upgrade is meant for use with CREC Stage 2 or Stage 2+ Performance Software and is engineered to keep the Eaton TVS 1320 Supercharger within its maximum recommended supercharger speed with a 7,400 RPM redline.Please Note: This Supercharger Pulley Upgrade must also be paired with the 034Motorsport Billet CREC Supercharger Clutch Delete Kit.Included is the properly sized Supercharger Belt for this pulley upgrade when used with the factory lower crank pulley. Pairing this pulley upgrade with the 179MM will require 7PK1290. Pairing this pulley upgrade with the 190MM crank pulley will require 7PK1320.CREC Stage 2 and 2+ require the Supercharger clutch to be deleted, so if you are purchasing this pulley upgrade to go to Stage 2 or 2+ and have yet to delete the clutch, add one of our Steel or Titanium CREC Clutch Deletes to your order. Features: 57.70mm In Diameter CNC Machined from 4140 Chromoly Billet Black Zinc Plated for Long-Lasting Great Looks Direct Replacement for OE Pulley For CREC 3.0T Only Increased Drive Ratio of The Supercharger. Spinning The Supercharger Faster Yielding Increased Boost Pressure Throughout the RPM Range. Increased Horsepower and Torque Throughout The Powerband When Paired With Stage 2 Performance Software 034Motorsport's Supercharger Pulley Upgrade is Meant For Use With Stage 2 or Stage 2+ Performance Software Engineered to Keep The Eaton TVS 1320 Supercharger Within Its Maximum Recommended Supercharger Speed With a 7,400 RPM Redline What's Included: 034Motorsport Supercharger Pulley Hardware New Replacement Belt OE Part Number Interchange: 06E 145 255 H Fitment Guide: 2016-2018 Audi A7 C7.5 3.0 TFSI 2015-2018 Audi A8 D4.5 3.0 TFSI 2017-2019 Audi Q7 4M 3.0 TFSI 2014-2017 Audi S4 B8.5 3.0 TFSI (Euro Only) 2014-2017 Audi S5 B8.5 3.0 TFSI (Euro Only)