603 MTech Autowerks

603 MTech Autowerks New England’s Trusted Independent Mercedes-Benz Specialists We service most Euro makes including Audi, VW, and BMW.
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- Streamlined Customer Experience
- Competitive Pricing
- Factory Diagnostic Equipment & Tools
- 24,000 Mile / 24 Month Warranty

Specialized in Mercedes-Benz.

07/17/2026

This 2016 AMG GTS came in with a blown turbo. The impeller completely came apart, sending debris through the exhaust and damaging the catalytic converter and O2 sensor.

The first question everyone asks is, “Was it the tune? Not necessarily. This Mercedes is tuned, but it’s also driven the way it was built to be driven. The owner regularly tracks the car and pushes it hard. Stock turbos can only handle so much heat and stress over time, and in this case overheating is the most likely cause of the failure.

To help improve reliability, we’re installing a Wagner Performance intercooler. Its larger, thicker core helps reduce intake temperatures during aggressive driving while we replace the damaged components.

Would you keep the stock turbos, or upgrade them while the car is apart?

07/16/2026

Mercedes cylinder wall scoring is a common problem on 2012 to 2016 Mercedes-Benz models equipped with the M278 engine, and it can also affect the M157 engine.

In this video, I show you how to inspect for cylinder wall scoring and explain why every M278 and M157 should have a bore scope inspection before you buy one. It could save you thousands of dollars and help you avoid buying an engine that’s already failing.

07/14/2026

Another rusty Mercedes in the shop, but this one isn’t here for a rear subframe or brake lines. This Mercedes came in with a rusty fuel tank that was actually leaking fuel. Most people are surprised to learn that not every Mercedes has a plastic fuel tank. This one is equipped with a PZEV (Partial Zero Emissions Vehicle) system, which uses a metal fuel tank designed to reduce evaporative emissions.

The downside? In areas where road salt is common, these metal tanks can rust from the outside in and eventually start leaking. If you’ve ever wondered why some Mercedes have a metal fuel tank instead of plastic, here’s the answer.



Have you ever seen one of these rust out?

07/10/2026

This SLK came in with a check engine light but left with a replacement engine. Early Mercedes M272 engines are well known for balance shaft failures. While the balance shaft can be repaired, the labor often makes it more expensive than installing a good used engine.

For this SLK, we sourced an updated 2007 engine with only 60,000 miles and replaced common failure items while it was out, giving the client a much more reliable Mercedes for years to come.

What would you do? Would you replace the engine or scrap the Mercedes? Let me know in the comments.

07/09/2026

Diagnostic fees are something certain people don’t like to pay, especially when they feel like they already know the answer. But a misfire doesn’t automatically mean spark plugs. It could be a coil. But on certain engines, it could also be something much more serious, like cylinder wall scoring, which basically means the engine needs to be replaced.

That’s why a proper diagnosis matters. We’re verifying the failure, checking the system, and making sure your money goes toward the right repair. A proper diagnosis can save you from replacing parts you don’t need and help catch bigger issues before they become a much bigger problem.

07/08/2026

Do harness extensions actually help? In my experience, they often create more problems than they solve. I’ve seen them contribute to extended crank times, check engine lights, and even shorting out components.

On many Mercedes engines, especially the M278, oil can travel through the camshaft position sensor wiring and make its way toward the engine control unit. Instead of adding these extensions, I recommend inspecting the camshaft position sensor connectors at every oil change. If there’s oil present, address the issue before it becomes a bigger problem.

Zack’s 3 Year Anniversary!! Thank you so much for the last 3 years. You’ve been with MTech longer than anyone else and h...
06/15/2026

Zack’s 3 Year Anniversary!! Thank you so much for the last 3 years. You’ve been with MTech longer than anyone else and have played a huge role in helping build this company into what it is today. Funny enough there was a time when I would answer the phones and everyone would ask for Mike. Now when I answer the phone everyone is asking for Zack. That alone tells you the type of person he is. He has earned the trust and respect of so many clients and I hear nothing but great things from our clients every single day.

I’m incredibly proud of the man you’ve become and the steps you’ve taken in life. Watching your growth over the years has been amazing and you deserve all the success that comes your way. Thank you for being one of the most genuine people I know and showing up for our clients, our team, and this company. Your hard work and dedication do not go unnoticed.

You truly are one of the best parts of 603 MTech Autowerks. Love you brotha ❤️

06/14/2026

Five years ago, I took a chance and started 603 MTech Autowerks. Looking back, none of this would have been possible without the support of our clients, followers, employees, friends, and family.

To every client who has trusted us with their Mercedes, thank you. To everyone who has followed our journey, shared our content, left a review, or recommended us to a friend, thank you. Your support has helped us grow more than you’ll ever know.

To the clients who travel from Massachusetts, New York, New Jersey, Maryland, Pennsylvania, and beyond, thank you for believing in us. I also want to thank my team. Zack, Adam, Alex, Jesse, and Josh, this wouldn’t be possible without you guys.

This year was especially meaningful as I welcomed my first son, Jelani Michael Perez. I look forward to teaching him the same work ethic and values that my dad taught me and most importantly, thank you to my dad. He helped build this dream from the ground up. From the floors and lighting to the paint and countless late nights, we wouldn’t be where it is today without him.

As we enter year five, we’re excited to become more involved in our community, attend more car shows, and continue growing something we’re all proud of. From the bottom of my heart, thank you for being part of this journey.

05/22/2026

This E63 AMG is already making around 720 wheel horsepower with a Stage 2 tune.

We’re installing over $10,000 in upgrades including VRP exhaust manifolds, an Armaspeed carbon fiber intake, and a VRP billet intake manifold to improve airflow and support more power from the M177 platform.

While we’re in there, we’re also replacing the engine mounts and oil separators as preventative maintenance.

Once everything is installed, the Mercedes will be heading back to the dyno for a custom tune. The owner’s ultimate goal is 800 wheel horsepower with a future high pressure fuel pump upgrade.

Do you think it will have 800 wheel horsepower?

05/16/2026

AMG engines are extremely advanced and require proper diagnostics, factory repair procedures, and technicians that actually understand these platforms. Just because someone can change parts doesn’t mean they understand how these engines are designed to operate.

Who do you trust working on your AMG?

Address

1298 Smyth Road Unit 24 & 25
Hooksett, NH
03106

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 4pm
Friday 8am - 4pm

Telephone

+16032326500

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