Mercedes W205 C300 Weistec ECU Upgrade

Price: $599.99 Each

The Weistec M274 ECU upgrade for the 2015+ C300 provides gains across the entire powerband resulting a vehicle that is more fun to drive in all driving situations.  The M274 ECU upgrade can be paired with our M274 Downpipe for further improved response and exhaust note  


*Power gains vary based on model and modifications.

*Product may not be emissions compliant.  Check local laws prior to installation. 



- Increased HP and Torque

- Improved Throttle Response

- Optimized Fuel and Spark

About Weistec Engineering


Based out of Orange County California, Weistec Engineering is an industry leader in research, development, and design. We have grown to provide customers with the highest level of satisfaction and value through relentless testing and continuous improvements in product and performance.

Specializing in computer aided design, and vehicle calibration, Weistec has the ability to manufacture quality products that are able to withstand even the most rigorous testing. From OEM vehicle manufacturers to the aftermarket performance enthusiast we aim to deliver innovative solutions that address a client’s needs.


Engineering and design are the core services of Weistec. Combined experience from mutiple fields by our technical department allows Weistec Engineering to offer an array of services and capabilities. Whether you have an idea drawn on a cocktail napkin, or are looking to improve an existing design, Weistec will bring your concept to reality while protecting design form, and engineering function.

Knowledge is power. Weistec’s capabilities are available to aid companies in solving tough engineering and development challenges. Along with that is the ability to provide realistic solutions that will ultimately aid our customers in making effective decisions when it comes to production.

Weistec’s team and equipment allow quality production in house, insuring nothing but the best quality and shortest lead times for our customers.


CAD, Computer Aided Design

CAM, Computer Aided Machining

FEA Simulation for Fluid Dynamics, Static and Dynamic Loading

Rapid Prototyping from SLA to Investment casting.

Plastic injection molding

Vacuum form molding


Complex sheet metal bend and form

Laser and waterjet cutting

Laser Engraving and Etching.



Reverse Engineering and Part Inspection

3D Laser Scanning

CMM, Coordinate Measuring Machine

Dimensional measurement

Profile measurement

Angularity or orientation measurement

Depth mapping



Shaft measurement

Images are provided by the manufacturer/supplier and may be a generic photo for representation purposes, and not of the actual product. Pricing also subject to change without notice.

GMP 710 Pressley Road Charlotte, NC 28217 Phone: 888.488.2028 Fax 704.523.4910