RENNtech | ECU Upgrade | SL 450 AMG | R231 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 porsche-718-cayman--my2016-18--esr3545487 CLASS S LONG (W 221)

CLASS S LONG (W 221) 351 V6 4-Matic Blue Efficiency (HP: 306 | Year: 11 > )

Rated by RENNtech:              550 HP @ 5

By ensuring the internal header bore surfaces are smooth

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though our proprietary tuning software and approach for Bentley is completely unique and independent from our Mercedes tuning program

RENNtech | ECU Upgrade | SL 450 AMG | R231 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 porsche-718-cayman--my2016-18--esr3545487 CLASS S LONG (W 221)RENNtech ECU Upgrade for 231 SL 450 AMG BiTurbo. Up to 402HP and 454LB FT. Gains: +40HP & +70LB FT RENNtech M276 Biturbo ECU Upgrades are TV approved! RENNtech tuning products are certified to meet CARB standards in all 50 States. RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your