This RENNtech-modified 2006 Mercedes-Benz CLS55 AMG was originally sold through Mercedes-Benz of Palm Beach to RENNtech founder Hartmut Fehyl and registered to RENNtech as a corporate vehicle in Florida. The car was built by RENNtech as a SEMA show car to showcase available modifications for the W219 chassis upon the first year of launch. Feyhl owned and drove the car through 2009 and added approximately 30k miles during his ownership. Finished in Green-Black Metallic (189) over Java AMG Leather (284), this AMG is powered by a supercharged 5.4-liter M113K V8 paired to a five-speed automatic transmission. The odometer currently shows 61k original miles. Factory features include bi-xenon headlamps, heated and ventilated front seats, four-zone climate control, factory COMAND, and a power-closing decklid. In addition, this car has been modified by RENNtech and now boasts more than $30k in RENNtech modifications including an upgraded RENNtech intercooler system, crank pulley, headers, throttle body, ECU tune, carbon fiber airbox, carbon fiber rear diffuser, V2 lowering module, camber bushings, toe links, Brabus-branded Alcon brakes, and various interior upgrades including carbon fiber trim and steering wheel. The car is now being offered by the seller with documented recent service, the factory toolkit, manufacturer’s literature, two keys, a RENNtech Certificate of Authenticity signed by Feyhl, a clean Carfax report, and a clean Illinois title.
The exterior is finished in Green-Black Metallic (189) and features AMG styling including sculpted bumpers, side skirts, a rear decklid spoiler, and dual twin-tipped exhaust. A RENNtech carbon fiber diffuser accents the rear of the car between the AMG exhaust tips along with carbon fiber mirror caps. Additional exterior features include a sunroof, bi-xenon headlights with curve illumination, and an AMG bodykit with sculpted bumpers and skits. The seller notes a couple small door dings and two inoperable keyless entry door handles. The body is accident-free as noted by the included Carfax and all glass remains original.
Staggered multi-piece AMG 19” wheels are fitted and wear new Continental tires measuring 255/35 up front and 285/30 in the rear. The chrome 2-piece wheels show only a small blemish on one of the wheels as noted in the gallery below. Tucked behind the wheels are Brabus-branded Alcon brakes. The car is lowered on factory air suspension using RENNtech's V2 lowering module.
In the cabin, the seats, shift knob, and door cards are trimmed in Java AMG leather (284) and accented with custom carbon fiber interior trim in place of wood veneer across the center console and dashboard. The factory steering wheel has been replaced with a matching alcantara and carbon fiber flat-bottom wheel displaying contrasting stitching. Factory COMAND remains in place and functional. The trim plate above the double-DIN head unit shows some scratches and the seller notes a replacement has been ordered which will be included in the sale. The COMAND display is noted to show a dead pixel but does not affect functionality. RENNtech-stitched floor mats are shown and included with the car.
The sculpted RENNtech leather and alcantara steering wheel frames white gauges featuring a 200-mph speedometer, 7k-rpm tachometer, and AMG-branded analog clock. Additional fuel and temperature gauges flank the cluster while the digital odometer can be seen at the base of the speedometer showing 61k miles. Additional gauges within the LCD display show COMAND features, trip functions, and various settings for vehicle settings. The digital LCD screens present as they should and show no signs of de-pixelation or fading.
The original 5.4-liter M113k V8 has been modified with a RENNtech intercooler system, crank pulley, headers, throttle body, ECU tune, and a carbon fiber airbox. This example is now rated at 588 horsepower and 616 lb-ft of torque. The original 722.6 five-speed automatic transmission has been replaced with a new rebuilt unit in October 2021 by the seller. Other recent maintenance includes the SBC recall, a new air spring in the rear left, and new inner and outer tie rod end links. Recent maintenance receipts can be seen in the gallery.
The car is now being offered by the seller with documented recent service, the factory toolkit, manufacturer’s literature, two keys, a RENNtech Certificate of Authenticity signed by Feyhl, a clean Carfax report, and a clean Illinois title.
A thorough video provided by the seller shows a full walk around, interior tour, cold start, and driving footage of the car. An additional video of the exhaust and a drive away has been added.
It’s rare that original RENNtech-modified cars change hands publicly. It’s even more rare to find an example with an accompanying note from RENNtech founder Hartmut Feyhl reminiscing over personally adding mile after mile on one of those few examples and enjoying every second of the journey. Whether you’re into RENNtech or not, this car makes for a great addition to any collection or collectible commuter for any enthusiast. While the provenance of the car carries weight, the CLS55 AMG was only produced for one year and is rarely seen in this color combination. This example is bound to draw attention for years to come no matter where it ends up.
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