Mercedes W177, A45/A45S AMG Titanium Valved Catback Exhaust

This is the A45 S exhaust taken as far as it goes. A full Titanium Valved Catback Exhaust for the Mercedes-AMG A45 S, built entirely from titanium with a heat-treated finish that runs violet, blue and bronze, a twin-valved rear muffler and the valve remote kit in the box.

Titanium is roughly forty per cent lighter than stainless steel at the same strength, and on a system this size that is real weight taken out of the back of a car that already changes direction better than almost anything in its class. It also holds heat differently, which is where a titanium system gets its characteristic harder, higher edge on overrun.

The colour is not a coating. It is what titanium does when it is heat treated, which is why no two systems come out identical and why it deepens rather than fades with use.

The valves are operated from the supplied remote, so the volume is your decision rather than something the throttle position decides for you. Closed, it is close enough to standard for an early morning. Open, it is a different car entirely.

Key Features

Independent Varex Valve System

Rather than reusing the restricted factory valves, this system operates its own dedicated valve assembly with complete travel in both directions. Sealed when closed for quiet running, and fully unobstructed when open for maximum flow and volume.

Full Titanium Construction

Titanium end to end, not a titanium tip on a stainless system. Substantially lighter than the factory exhaust, and the weight comes out of the rear of the car.

Heat Treated Finish

The violet, purple and bronze running through the pipework is the titanium itself, brought out by heat treatment rather than applied on top of it.

Twin Valve Rear Muffler

A valve on each exit rather than a single restriction, so both sides of the system open together and the note stays even across the car.

Remote Kit Supplied

The handset, receiver and loom are included in the box. Nothing else to buy and no connection to the factory valve motors.

Precision TIG Welded

Titanium is unforgiving to weld and every joint on this system shows it, with clean stacked welds throughout.

Direct Bolt-On Fitment

Fits at the factory mounting points and hangers, using the original rubber isolators. No cutting and no fabrication.

Performance Benefits

A deeper, harder exhaust note with the valves open
Near-standard volume with the valves closed
Significant weight saving over both the factory and stainless systems
Reduced restriction through the centre and rear sections
Sharper throttle response and a more urgent top end
A finish that no stainless system can reproduce

Why Choose Titanium

Titanium is the material every factory motorsport programme reaches for, and the reasons are simple. It is far lighter than stainless steel for the same strength, it tolerates heat better, and it does not corrode. On a road car the weight saving is what you feel first, and the finish is what everyone else notices.

W177 Hatch Only - Check Before You Order

This is a full rear-section replacement, and a rear section follows the body rather than the engine. It is shaped for the W177 A45 hatch and nothing else.

Our M139 downpipes cover the A45, the CLA45 and the GLA45, because those follow the engine and all three share it. This catback does not. A C118 CLA45 is a four-door coupe and an H247 GLA45 is an SUV — different floor, different silencer position, different exit geometry. If you have either of those, contact us rather than ordering this.

Vehicle Fitment

Mercedes-AMG A45 / A45 S - W177 (2019-2025)

2.0L Turbocharged M139 Engine

Hatch body only

Please Note

Professional installation is recommended. Exhaust sound will vary depending on whether a factory or aftermarket downpipe is fitted.

Check your local road rules before fitting. Exhaust noise requirements vary by state and a vehicle must remain compliant for road use.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — Volkswagen GTI & R models, Audi S/RS platforms, BMW M cars and Mercedes-AMG. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.