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SL 550

RENNtech ECU Upgrade for SL 550 (R230- 402 HP / 405 TQ)

RENNtech ECU Upgrade for 230 - SL 550. Up to 402HP and 405TQ. Gains: +20HP & 14TQ

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R1 Performance Package | R230 | SL 550 | 413 HP / 422 TQ | 5.5L NA V8 | M273

R1 Performance Package for 221 - S 550. Includes ECU Upgrade and Stainless Steel Header. Up to 413HP and 422 TQ. Gains: +31HP & +31TQ

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