If you're looking for an overdrive blower pulley for your AUDI (B8.5) A4 A5 (C6 C7 C7.5) A6 A7 A8 Q5 S4 S5 with the 3.0T supercharged 3.0 TFSI Gen 1 or Gen 2 engine this is for you.  This is for those of you that have a press on pulley from the factory and want to go smaller for more boost.  I can make any size but most common is to go from the stock 63.25 mm (2.49") pulley to a 57.75 mm (2.27") pulley.  The other nice thing about these is that they're modular so if you want to add more boost in the future I can make another pulley that all you have to do is unbolt on and bolt on a different size.  The hub gets pressed on once and then future pulley swaps are a breeze.

Smoothflow Pulleys has been making supercharger pulleys for over 15 years for many different cars and is happy to give yours some more boost as well!