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1. 

   MFR# 16586MagnaFlow Exhaust Products - Touring Series Performance Cat-Back Exhaust System

   MagnaFlow Exhaust Products

   $1,501.00$2,371.93

   Save $870.93 (37%) off MSRP
2. 

   MFR# B1103-C1103LRThermal R&D - Cat Back Exhaust

   Thermal R&D

   $899.96
3. 

   MFR# SSXAU048Milltek Sport - Cat Back w/o Resonator

   Milltek Sport

   $1,236.95
4. 

   MFR# SSXAU046Milltek Sport - Cat Back w/ Resonator

   Milltek Sport

   $1,352.40
5. 

   MFR# SSXAU100Milltek Sport - Cat Back w/ Resonator

   Milltek Sport

   $1,257.17

Popular mods for 2004 Audi S4

1. 

   MFR# SSXAU100Milltek Sport - Cat Back w/ Resonator

   Milltek Sport

   $1,257.17
2. 

   MFR# SSXAU296Milltek Sport - Cat Back w/ Resonator

   Milltek Sport

   $1,257.17
3. 

   MFR# 8040 1283SPORTKoni - Sport Yellow Shocks Rear

   Koni

   $156.24$252.00

   Save $95.76 (38%) off MSRP
4. 

   MFR# 29310-1H&R Suspension - Street Perf. Coil Over

   H&R Suspension

   $1,580.00
5. 

   MFR# 72257H&R Suspension - Sway Bar Kit

   H&R Suspension

   $695.99