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and turbo upgrades
670 wtq @ 4
GL550 (X166 | MY2013-16 | AWD | M278 | 4
Our proprietary ECU upgrade for the Mercedes M157 engine offers huge gains in performance across the entire RPM range without sacrificing around-town comfort or daily driver reliability
Rated by RENNtech: 696 HP @ 5
RENNtech R2 Pkg | C217 | S 63 AMG | Coupe | 716 HP / 826 LB-FT | M157 | 5.5L V8 BiTurbo mercedes-benz-glk-class--204---2010-present--glk-350-blue-effiency-esr1676768 and turbo upgradesR2 includes: ECU Upgrade, Diverter Valve, Air Filters, Sport Mufflers and CF Airbox Gains: +111HP; +147LB FT The RENNtech R2 Performance Package is the evolution stage of the R1 Pkg. The R2 not only brings additional power, but also gives the car a deeper sport sound that keeps with character of a luxury performance vehicle. Included in the R2 Package are all upgrades from the R1 Pkg, ECU Upgrade, Diverter Valve and Air Filters, as well as the Carbon
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