Mercedes A45 AMG S 177 Performance Parts & Tuning Mods

Top Brands For Mercedes A45 AMG S 177 Upgrades

The Mercedes A45 AMG S 177 is backed by a strong range of aftermarket brands, offering everything from power upgrades to chassis and styling mods. Below you will find leading manufacturers known for producing high quality tuning parts for this platform.

Exterior Styling Mods For Mercedes A45 AMG S 177

To make your Mercedes A45 AMG S 177 stand out, you can choose from a range of exterior styling upgrades including aggressive body kits, deeper front splitters, rear diffusers, spoilers and custom grilles, all designed to sharpen the car’s road presence and give your AMG a more unique, motorsport-inspired look.

Handling, Suspension & Dynamics Upgrades

For the Mercedes A45 AMG S 177, the best place to start is tyres and brakes. A set of quality UHP or semi-slick tyres transforms front-end grip and traction, giving you more confidence on fast road and track. Pair that with performance brake pads, braided lines and high-temp fluid for stronger bite and better consistency, or a big brake kit if you are doing regular track days and want serious stopping power without fade. From the factory the A45 S can feel a bit nose-heavy and stiff over poor surfaces, which can lead to safe but dull understeer when you are really pushing. Sorted coilovers or carefully chosen lowering springs with matched dampers help control body roll and improve agility without ruining ride quality. Uprated anti-roll bars, strut braces and fresh polyurethane bushes sharpen the chassis, making the car feel more connected and precise in quick direction changes. Do the upgrades in stages, test each step, and you will end up with an A45 AMG S that feels much more playful, stable and rewarding in the corners.

Frequently Asked Questions

What are the best first performance mods for a Mercedes A45 AMG S 177?

The A45 AMG S 177 is quick out of the box, but a few simple upgrades make it feel much sharper. Most owners start with an ECU remap or tuning box, a high-flow panel filter or intake, and a more free-flowing exhaust or OPF-back system to help the turbo breathe better.

Those basic mods give you a noticeable bump in horsepower and torque, crisper throttle response, and a nicer soundtrack, without turning the car into something awkward for daily use. From there, you can look at an uprated intercooler and turbo inlet for more consistent power on hard road or track use.

How much power can I gain from a remap on my A45 AMG S 177?

A well developed ECU remap on the A45 AMG S 177 can release a healthy increase in power and mid-range torque, even on a otherwise stock car. You will feel stronger pull from lower down the revs and better flexibility in higher gears.

Exact figures vary depending on fuel quality, hardware mods like intake and exhaust, and how aggressive the map is. We always recommend a balanced map that keeps exhaust gas temps and drivetrain stress sensible, so the car stays reliable for fast road use and the occasional track day.

Will tuning and performance parts affect the reliability of my A45 AMG S 177?

Any time you add power you increase stress on the engine, gearbox and drivetrain, but done properly with quality parts and sensible tuning the A45 AMG S can remain very reliable. Regular oil changes, premium fuel and allowing the car to warm up and cool down properly are key.

Supporting mods like an uprated intercooler, fresh spark plugs, and good quality oil help keep things safe when running more boost. Avoid cheap no-name parts or overly aggressive maps and you will massively reduce the risk of issues.

Will a tuned A45 AMG S 177 still pass MOT and be road legal?

An ECU remap itself does not stop the car passing an MOT, as long as all emissions equipment is in place and working correctly. Most OPF-back and cat-back exhaust systems designed for road use will also be MOT friendly.

Where you need to be careful is with sports cats or decat downpipes, as these can affect emissions and legality. If you are unsure, ask before you buy and we can recommend parts that suit your plans, whether that is a road-friendly setup or a more track-focused build.

What wheel and tyre sizes work best on the Mercedes A45 AMG S 177?

The A45 AMG S 177 comes with aggressive factory wheels, but many owners move to lighter aftermarket alloys or performance rims for better handling and a sharper look. Common choices are 19 inch wheels with sensible widths and offsets that clear the big brakes without rubbing.

If you are planning to run wider tyres for more grip, it is worth checking exact fitment, offset and tyre profile, especially on lowered cars. A good quality performance tyre makes a bigger difference than most people expect, and is one of the best value handling upgrades you can do.

Do I need to upgrade the brakes and suspension when tuning my A45 AMG S 177?

The stock A45 AMG S brakes are strong, but if you drive hard on B-roads or do track days, uprated pads, high-temp brake fluid and performance discs are a smart move. They help resist fade and give you more consistent pedal feel.

For suspension, a good set of lowering springs or coilovers, combined with quality tyres, transforms the way the car turns in and puts power down. You do not have to slam it, a modest drop with properly matched dampers keeps it usable on UK roads while tightening up the chassis.

Is a full exhaust system worth it on the A45 AMG S 177?

A performance exhaust on the A45 AMG S 177 is not just about noise. A well designed cat-back or OPF-back system can reduce back pressure, help the turbo spool more freely, and shave a bit of weight off compared to the factory setup.

Matched with an intake, intercooler and a proper ECU remap, an exhaust becomes part of a complete package that supports reliable, repeatable power. If you want more drama without going over the top, we can guide you to systems that deliver a deeper tone without constant drone on the motorway.