Want to modify or upgrade your 2006-2009 Audi S4 with aftermarket catalytic converter universal? At OGTuners.com we have a great selection of aftermarket performance parts for your Audi S4. We have 4 catalytic converter universal parts available in our store with free shipping to the Continental US.
Magnaflow Universal Converter
 $585.00 441204MagnaFlow Conv Universal 2.00 inch Rear CA IN STOCK (4) SHIPS FROM MANUFACTURER (Last checked: 11/04/2025) Shipping times vary by Manufacturer (Can take days or weeks, contact us for an ETA) 2004-2006 Audi S4 Avant / Base / Cabriolet |
 $516.00 441205MagnaFlow Conv Universal 2.25 Rear 540 IN STOCK (1) - LOW SHIPS FROM MANUFACTURER (Last checked: 11/04/2025) Shipping times vary by Manufacturer (Can take days or weeks, contact us for an ETA) 2006-2006 Audi S4 Avant / Base / Cabriolet |
 $194.00 51204MagnaFlow Conv Univ 2in Inlet/Outlet Ctr/Ctr Round 9in Body L x 5.125in W x 13in Overall L 49 State IN STOCK 2004-2008 Audi S4 Avant / Base 2004-2009 Audi S4 Cabriolet |
 $178.00 99204HMMagnaFlow Conv Univ 2.00inch IN STOCK 2004-2008 Audi S4 Avant / Base 2004-2009 Audi S4 Cabriolet |