Akrapovic G82 M4 Exhaust: Titanium Systems (2021+)

The Akrapovic G82 M4 exhaust range is the most comprehensive titanium upgrade you can fit to BMW's current super-coupe. Built for the 2021-and-up G82 Coupe and G83 Convertible — the twin-turbocharged S58 cars, including the Competition, xDrive, and CSL — these systems pair Akrapovic's in-house foundry collectors and aerospace-grade titanium with hand-crafted carbon-fibre tailpipes. Whether you want a single Slip-On Line that bolts up cleanly to the factory OPF/GPF setup, or a full race-oriented build with link pipes and a Sound Kit, every component here is engineered specifically for the G8x M3/M4 chassis family and confirmed to fit your G82/G83 M4. At NLP Performance, we stock the full slate so you can match the exhaust to the car you actually drive.

What Akrapovic offers for the G82 / G83 M4

Akrapovic's G8x program is modular by design. At its core sits the Slip-On Line (Titanium), the homologated centerpiece that replaces the stock muffler section. From there you can specify how the system finishes and how loud it gets: choose the version that ships with carbon tips, or a tips-required version that you pair with one of the dedicated Carbon Design Tail Pipe Sets (octagonal or classic). For owners chasing maximum aggression, the Evolution Short Link pipe (without resonator) opens the system up for closed-course use, while the Sound Kit adds electronic control over the soundtrack. M4 owners running the gasoline particulate filter will also need the model-specific OPF/GPF Fitting Kit. Each of these pieces is verified to fit the G82 Coupe and G83 Convertible alongside their G80 M3 and G87 M2 siblings.

The flagship: Slip-On Line (Titanium) — material, tips, construction

The Slip-On Line is the heart of the lineup. The whole muffler assembly is fabricated from high-grade lightweight titanium, and Akrapovic casts the system's pair of collectors in its own foundry — a level of in-house manufacturing few aftermarket brands match. The result is a system roughly 35 percent lighter than the factory unit it replaces, shedding around 8.3 kg from the rear of the car where it matters most for balance.

On the tail end, Akrapovic offers two distinct looks. The version that ships with carbon tips uses an octagonal tailpipe shape fashioned from lightweight titanium with a carbon-fibre outer sleeve — a signature Akrapovic detail. For buyers who prefer a more traditional finish, the same system pairs with the Classic Carbon Design Tail Pipe Set, built from the same materials in a cylindrical profile. Both the carbon-tip flagship and the tips-required base system carry the same titanium muffler core, so the choice is purely about appearance and how you want to specify the build.

Tail Pipe Sets & tips: octagonal vs classic

If you order a Slip-On Line in its tips-required form, you finish the system with one of two dedicated carbon tail pipe sets. The Octagonal Carbon Design Tail Pipe Set delivers Akrapovic's modern, motorsport-derived octagonal outlets — the same shape used on the carbon-tip flagship. The Classic Carbon Design Tail Pipe Set takes a more restrained cylindrical route for owners who prefer a subtler rear-end look. Both are built from the same titanium-and-carbon recipe and bolt directly to the G8x system, so the decision is about styling alone. These tail pipe sets are confirmed to fit the G82 M4 alongside the G80 M3 and G87 M2.

Sound Kit, link pipes & valve control

The Slip-On Line ships with a specially developed Akrapovic control kit so the exhaust delivers its full sound experience straight out of the box, working with the car's factory valve system. For owners who want even more command over the soundtrack, the dedicated Akrapovic Sound Kit adds electronic control hardware tuned to the G8x platform. The result is a system that stays refined at a cruise — a rich, civil tone — and opens into a deep, sporty inline-six wail when you drive it hard, all without the boomy drone that plagues lesser systems.

For the most aggressive build, the Evolution Short Link pipe (without resonator) removes the secondary catalytic converters for a meaningful jump in volume and a rawer, more unfiltered S58 voice. Be clear-eyed about the trade-offs: Akrapovic positions this link pipe for closed-course and racetrack use, it requires a supporting ECU remap, and fitting it voids the ECE type-approval that the standalone Slip-On Line carries. It is the right choice for a dedicated track build, not for a car that needs to pass an emissions inspection.

Weight savings & materials: titanium and carbon

Weight is where titanium earns its premium. The Slip-On Line is roughly 35 percent lighter than the factory exhaust, a reduction on the order of 8.3 kg. On a car as rear-biased and dynamically sharp as the M4, removing mass from behind the axle line genuinely improves how the chassis loads up mid-corner and how quickly it changes direction. The carbon-fibre tailpipes add to the effect while delivering the visual signature Akrapovic is known for. Every component — the Slip-On Line, the tail pipe sets, and the Evolution link pipe — is built from the same high-grade titanium and carbon, so a fully specified build is lighter end-to-end than the equipment it replaces.

Sound & performance: what to expect

On Akrapovic's own dyno, the Slip-On Line returned a measured gain of 8.0 kW (about 10.9 hp) at 6,000 rpm and an additional 13.9 Nm of torque at 5,000 rpm, tested against a BMW M4 Competition fitted with the standard stock exhaust. Those are honest, manufacturer-published figures — meaningful improvements in the upper rev range that you feel as a freer-revving top end rather than a transformative power jump. The bigger story is character: the freer-flowing titanium muffler and reduced backpressure let the twin-turbo S58 breathe and sing in a way the muted factory system suppresses. Expect a richer cruising note and a deeper, harder edge under load, with the Sound Kit and link pipe available to dial the intensity up from there.

Fitment: years, engine code & variants this fits

These systems are engineered for the second-generation M4 — the G82 Coupe and G83 Convertible, built from 2021 onward and powered by the 3.0-litre twin-turbocharged S58 inline-six. Because Akrapovic developed the G8x platform as a family, the Slip-On Line, both tail pipe sets, the Evolution link pipe, and the Sound Kit are shared across the G87 M2, G80 M3, and G82/G83 M4. That means the same flagship Slip-On Line fits the standard M4, the M4 Competition, the Competition xDrive, and the CSL — G83 in the lineup refers specifically to the drop-top Convertible. The one M4-specific piece here is the OPF/GPF Fitting Kit, which is dedicated to the G82/G83 M4 emissions hardware. Always confirm your exact build (OPF/GPF or not) against your VIN before ordering.

Installation & what's required

As a slip-on, the flagship system replaces the rear muffler section and bolts to the factory mounting points — a manageable job for an experienced BMW specialist. Two requirements are worth flagging before you order. First, if you choose a Slip-On Line in its (Req. Tips) form, you must add a Carbon Design Tail Pipe Set (octagonal or classic) to complete the system; the carbon-tip flagship already includes its octagonal tips. Second, M4s equipped with the gasoline particulate filter need the model-specific OPF/GPF Fitting Kit to mount the system correctly. If you go further with the Evolution link pipe, budget for a professional ECU remap as well, since Akrapovic specifies it as mandatory and the result is a track-only configuration.