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SL 550 BiTurbo

RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625TQ | 4.7L V8 BiTurbo | M278

ECU Upgrade | 500HP / 625LB-FT | Gains: +26HP / +59LB-FT

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RENNtech Stainless Steel Muffler for 231 - SL 550

RENNtech Stainless Steeel Sport Muffler for 231 - SL 550. Gaines: +15HP & 20TQ

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RENNtech ECU+ Upgrade | R231 | SL 550 | 540HP / 705TQ | 4.7L V8 BiTurbo | M278

ECU+ Upgrade | 540HP / 705LB-FT | Gains: +66HP / +139LB-FT

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