S 221 (2007-2013) - S-Class

RENNtech Intercooler Pump Upgrade Kit

RENNtech Full Intercooler Upgrade Kit.

RENNtech Full Intercooler Upgrade Kit.

RENNtech Stainless Steeel Exhaust Headers for M156 - 63 AMG Engines (216-CL / 221-S). Gaines: +11HP & 20TQ

RENNtech Stainless Steel Sport Muffler for 216 - CL 63 AMG & 221 - S 63 AMG for M156 Series. Gains: up to 10HP & 15 TQ

RENNtech 100% Locking Limited Slip Differential

RENNtech Stainless Steel Sport Muffler for 216 - Cl 600 & 221 - S 600. Gaines: +10HP & 15TQ

RENNtech Full Intercooler Upgrade Kit.

RENNtech Stainless Steel Exhaust Headers for M273 Engines (216-CL / 221-S). Gaines: +11HP & 20TQ

Intermediate ECU Upgrade | Up to 638HP / 695TQ | Gains: +75HP / +101TQ

ECU+ Upgrade | Up to 669HP / 734TQ | Gains: +106 HP / +140TQ