RENM performance Mercedes SL550 M-Max

The Mercedes Benz SL550-Class is sometimes overlooked when compared to more highly specified models, particularly the SL63 AMG, even though it remains a very desirable roadster. RENM performance has turned its attention to the SL550 realising the untapped potential of this car. Their reworking of SL550 M-Max has won us over for its striking new looks while breathing new life into this classic roadster.

The V8 M273 engines in the SL 550 are technically advanced and quite powerful. In standard form, the 5.5-liter V8 produces 382 HP (284KW) at 6000rpm and 529NM between 2800 and 4800rpm. Compared to similar models from other manufacturers, it is a reasonably nimble performance oriented roadster.


Working together with Kleemann, RENM performance has created the ‘M-Max’, which releases considerably more power and performance for this model. The flexibility of the programme is designed to fit individual needs and purposes, so all tuning components can be used individually, or in predetermined sets.

The tuning programme for the SL 550 M-Max consists of an ECU re-calibration, hi-flow air filters, revised stainless steel exhaust headers and down pipes, sports catalytic converters and sports camshafts, delivering up to 460 HP (343 KW) and 630 Nm. This results in a significant improvement in overall performance, with 0-60mp/h times being reduced from 5.3 sec to 4.6 sec.

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The visual changes reflect RENM design philosophy which is characterised by an ‘understated subtle aggressiveness’. This design objective is aimed at achieving integrated, balanced performance combined with visual understatement. The RENM M-Max achieves this objective successfully, and when combined with the matching M-Max light weight forged wheels, completely transforms the SL 550 to a new level of performance.

For more information on the SL550 M-max upgrade contact RENM performance at

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