RENNtech

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RENNtech Since 1989, RENNtech has evolved to be the foremost authority of Mercedes-Benz and luxury vehicle tuning and aftermarket performance products.
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RENNtech has become the premier Mercedes-Benz specialist and Hartmut Feyhl himself is regarded by many as USA’s foremost authority in Mercedes tuning. His vast experience comes from 12 years spent at AMG Germany before serving as the North American division’s Technical Director. Prior to the tuning company’s merger with Mercedes-Benz in 1999, by the request of AMG Germany, Feyhl branched out on his own to start RENNtech and service the existing AMG North America customers. Performance without compromise. This is the foundation upon which we have built our reputation. Established in 1989 by Hartmut Feyhl, RENNtech has evolved and grown from servicing AMG’s customers into the foremost authority on tuning and customizing AMGs and Mercedes-Benz. RENNtech also offers tuning solutions for Porsche, Audi and Bentley vehicles, along with other European luxury cars. Over the years, we have developed high-performance products for virtually all Mercedes-Benz AMG vehicles. Some of the most notable among these are the 200 mph RENNtech E7.4RS (which claimed ‘Fastest Sedan in the World’ honors by Car and Driver Magazine in 1996) and the more recent 945 LB-FT 5.5L V8 Biturbo RENNtech R3+ Monster. Each of these vehicles are just a sampling of what RENNtech has achieved, featuring extreme performance, upgraded aesthetics and a fit and finish that rivals factory vehicles.

Taking it back to one of our early V12 transformations! This 2005 Mercedes-Benz SL 600 (R230) received a complete RENNte...
10/22/2026

Taking it back to one of our early V12 transformations! This 2005 Mercedes-Benz SL 600 (R230) received a complete RENNtech makeover, combining serious performance gains with refined styling and improved driving dynamics.
At the heart of this build is our RENNtech R3 Performance Package, featuring our ECU and TCU upgrades, full carbon fiber airbox, high-flow intercooler pump, 100% locking limited-slip differential, and reinforced transmission internals.
The result? 650 HP and 800 LB-FT of torque, an impressive increase of +157 HP and +210 LB-FT over stock!
To complement the additional power, we installed our handcrafted RENNtech Stainless Steel Sport Mufflers, paired with custom 200-cell catted downpipes and custom quad oval AMG tailpipes for a deeper, more aggressive V12 soundtrack.
The transformation continued with our RENNtech Brake Upgrade, featuring stainless steel braided brake lines, high-performance pads, custom-drilled rear rotors to match the OEM fronts, and AMG brake calipers finished in RENNtech-painted high-heat red.
Our RENNtech V3 Digital Lowering Module delivers an aggressive, fully adjustable stance, while a set of RENNtech RPS 10.2 wheels completes the look.
More power. Sharper handling. An unmistakable V12 soundtrack. And a look to match.
Two decades later, this SL 600 remains a prime example of RENNtech’s passion for Mercedes-Benz performance and engineering.
Own a Mercedes-Benz V12? Let RENNtech take it to the next level 🔥

You don’t buy a Mercedes-AMG V12 to settle for ordinary performance. Why settle for stock? 🔥The Mercedes-Benz S 65 AMG C...
10/20/2026

You don’t buy a Mercedes-AMG V12 to settle for ordinary performance. Why settle for stock? 🔥
The Mercedes-Benz S 65 AMG Coupé (C217) is already a powerhouse, but at RENNtech, we know there’s more performance waiting to be unleashed from its legendary 6.0L V12 BiTurbo engine.
With the RENNtech ECU Upgrade, unlock up to 670 HP and 840 LB-FT of torque, delivering gains of +49 HP and +102 LB-FT 🔥
Engineered through decades of Mercedes-Benz tuning expertise, our proprietary ECU software optimizes engine performance, throttle response, and power delivery across the entire RPM range, without compromising everyday drivability.
And with the RENNtech Hand-Held Tuner (HHT), you can switch between stock and RENNtech-tuned ECU programming directly through your vehicle’s OBD2 port. No ECU removal required.
Don’t leave performance on the table. Trust the Mercedes-Benz tuning specialists at RENNtech to take your V12 to the next level.
🔗 Shop through the link in our bio or send us a DM to find out what we can do for your V12

10/16/2026

ISO A SR ACCOUNTANT/CONTROLLER

Position Type: Full-Time
Location: STUART, FLORIDA On-site
Reports To: Ownership
Salary: Commensurate with experience

Position Overview

We are seeking an exceptionally accurate, detail-oriented, and experienced Senior Accountant / Controller to oversee and execute all financial operations for our multi-divisional organization. Reporting directly to ownership, you will manage the complete accounting cycle, ensuring all financial records and reporting duties are executed up to financial statements ready for audit control.

The ideal candidate possesses deep experience handling the unique accounting structures of Project Management, Manufacturing, Service, and Sales divisions. Strong ERP experience is a baseline requirement, with specific experience in Acumatica being a highly valued plus.

Key Responsibilities

• Financial Oversight & Reporting: Execute the full accounting cycle, preparing comprehensive, accurate, and timely monthly, quarterly, and annual financial statements ready for external audit.
• Multi-Divisional Accounting: Manage, reconcile, and optimize accounting processes across four distinct business units: Project Management (job costing), Manufacturing (inventory/COGS), Service, and Sales.
• Compliance & Filings: Manage and execute all corporate compliance filings, including sales tax across applicable jurisdictions, payroll administration, 401(k) plan management, and state and federal compliance filings.
• ERP & Technology Optimization: Utilize and maintain our core ERP system to ensure clean data integrity; leverage Acumatica (if applicable) and advanced Excel modeling to optimize financial workflows.
• Ad-Hoc Analysis: Provide ownership with accurate, data-driven financial insights, variance analyses, and cash flow projections to support strategic business decisions.

Qualifications & Requirements

• Experience: Minimum of 5–7+ years of progressive accounting experience, ideally operating as a Senior Accountant, Accounting Manager, or Controller in a multi-divisional environment.
• Divisional Expertise: Demonstrated background in handling job costing, manufacturing inventory, service-cycle billing, and sales-revenue recognition.
• Technical Skills:
• Solid, hands-on experience with robust ERP systems (experience with Acumatica is highly preferred).
• Advanced proficiency in Microsoft Excel (VLOOKUPs, Pivot Tables, advanced formulas) and the Microsoft Office suite.
• Compliance Proficiency: Proven experience accurately managing payroll cycles, sales tax reporting, 401(k) oversight, and standard state/federal business compliance filings.
• Attributes: High level of autonomy, zero-error mindset, absolute integrity, and excellent communication skills when collaborating directly with business owners.

Hiring Requirements

• Professional references required upon request.
• A thorough background check will be conducted as a condition of employment.

Benefits & Compensation

• Competitive salary commensurate with experience.
• Health, Dental, Vision insurance, 401(k) matching, PTO, available.

How to Apply

Please submit your resume and at least three valid employment references along with a brief cover letter outlining your experience with ERP systems (specifically Acumatica, if any) and your background managing manufacturing or project-based accounting, with your salary expectations to [email protected] or to [email protected]

This RENNtech Mercedes-AMG GT C got a complete carbon fiber aero transformation, including:⚡ Carbon Fiber Performance Ho...
10/09/2026

This RENNtech Mercedes-AMG GT C got a complete carbon fiber aero transformation, including:

⚡ Carbon Fiber Performance Hood
⚡ Carbon Fiber Front Splitter
⚡ Carbon Fiber Fender Extractors
⚡ Carbon Fiber Bumperette Delete
⚡ Carbon Fiber Rear Wing

Every component is meticulously engineered to elevate aerodynamic performance, enhance aggressive styling, and deliver the unmistakable RENNtech presence.

No shortcuts. No compromises. Pure RENNtech performance.

Ready to transform your AMG GT? Explore our carbon fiber upgrades and take your build to the next level.

🔗 Shop now at Store.renntechmercedes.com or click the link in our bio

HISTORY WAS MADE  ! Renntech has officially turned into a global automotive tuning powerhouse a narrative defined by the...
10/08/2026

HISTORY WAS MADE ! Renntech has officially turned into a global automotive tuning powerhouse a narrative defined by the exact concepts that its founder, Hartmut Feyhl started 37 years ago …. PERFORMANCE WITHOUT COMPROMISE !

10/06/2026
Just happened yesterday… This is a WORLD RECORD for the highest recorded sale for a RENNtech custom built 1990’s OR ANY ...
10/06/2026

Just happened yesterday… This is a WORLD RECORD for the highest recorded sale for a RENNtech custom built 1990’s OR ANY SL car sold ever at Auction to date!

RENNtech is becoming the brand for collectors around the world and I am so very proud of my husband for the years he has spent in his craft to be recognized amongst the world’s elite collector market!

Address

7825 SW Ellipse Way
Stuart, FL
34997

Opening Hours

Monday 9am - 6pm
Tuesday 9am - 6pm
Wednesday 9am - 6pm
Thursday 9am - 6pm
Friday 9am - 6pm

Telephone

+15618457888

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