Akrapovic BMW M8 Cat-Back Exhaust Review (2020-2025)

The Akrapovic BMW M8 cat-back exhaust is the upgrade that finally lets the S63 twin-turbo V8 breathe and sing. BMW's flagship M car makes 600 hp in standard M8 trim and 617 hp as the M8 Competition, yet it leaves the factory with a muted, filtered soundtrack that hides the character of its 4.4-liter engine. At NLP Performance in Tampa, FL, the Akrapovic Evolution Line is the exhaust our M8 owners ask for by name — a full titanium system that strips 22.5 lbs off the car while transforming the sound. In this review we cover the specs, sound, fitment across the F91, F92, and F93 body styles, and how it compares to the loud-and-proud Borla ATAK.

What Makes the Akrapovic Evolution Line the Best M8 Exhaust?

The Akrapovic Evolution Line is a full cat-back system machined from high-grade lightweight titanium alloys, engineered specifically for the 2020-2025 BMW M8. Unlike a slip-on that only swaps the rear muffler, the Evolution Line replaces the pipework from the catalytic converters back, which is where the real weight and sound gains live. The central muffler uses a twin-valve layout — one valve on each side — so the car keeps its factory-style quiet-to-loud switching while adding a deeper, richer tone at every rpm.

There is a reason the S63 needs help in the first place. BMW's 4.4-liter twin-turbo V8 is one of the great modern engines — 600 hp in the M8, 617 hp in the M8 Competition, and 553 lb-ft of torque available from just 1,850 rpm — but the turbochargers sit between the combustion event and your ears, scrubbing away much of the raw induction and exhaust noise. The factory system then adds heavy silencing and, on some markets, particulate filtering. The result is a 3.0-second-to-60 super-GT that sounds far more muted than it drives. A cat-back like the Evolution Line is the single most effective way to give the exhaust note back its edge without touching the tune or the turbos.

Akrapovic offers the M8 system in two part numbers so the fitment is exact for your body style. The S-BM/T/23 fits the F91 convertible and F92 coupe, while the S-BM/T/25 is built for the four-door F93 Gran Coupe. Both are titanium Evolution Line cat-backs finished with carbon-fiber tailpipes, and both are plug-and-play with the M8's factory valve control. Each system is developed on Akrapovic's own engine dynos and sound benches, then validated on the car, so the fit at the hangers and the connection to the factory flap actuators is exact — no cutting, welding, or check-engine lights.

How Much Weight Does the Titanium Exhaust Save?

The Akrapovic Evolution Line saves 22.5 lbs over the factory M8 exhaust. That figure matters more than it sounds: the OEM stainless-steel system is one of the heaviest single components at the rear of the car, so removing over 22 pounds from behind the rear axle lowers mass exactly where it improves the M8's balance. Titanium is roughly 40% lighter than the stainless steel used in the factory system while tolerating the high exhaust-gas temperatures of a boosted 4.4-liter V8.

Because it is a cat-back, the Evolution Line retains the M8's factory catalytic converters, so it does not chase big dyno numbers — expect only a few horsepower from the reduced backpressure. The real return on investment is the weight loss, the sound, and the jewelry-grade titanium and carbon hardware that replaces the plain OEM tips.

What Does the Akrapovic M8 Exhaust Sound Like?

The Akrapovic Evolution Line gives the M8 a deep, muscle-car-flavored V8 tone with a sharper higher-frequency edge, and it eliminates the cabin drone that plagues cheaper systems. Akrapovic's sound engineers tuned the system to bring out the natural character the turbochargers normally muffle, so the car sounds bigger and angrier without becoming tiresome on a long highway pull. With the twin muffler valves closed, it stays civil for early-morning starts; open, it delivers the full, layered bark the S63 always deserved.

In real-world driving the character is exactly what M8 owners hope for. At a cold start the valves stay closed and the car is neighbor-friendly, only hinting at the V8 underneath. Roll into the throttle in Sport and the tone deepens into a hard-edged bark, with crisp overrun crackle on lift and a clean, layered wail as the tach sweeps toward the 7,000-rpm redline. Critically, Akrapovic tuned out the boomy resonance that makes many aftermarket systems unbearable at a steady 75-mph highway cruise, so the M8 stays a genuine grand tourer when you want it to be.

For owners who want the last word in sound control, the plug-and-play system pairs with the optional Akrapovic Sound Kit, which lets you switch valve modes independently of the drive-mode settings. Akrapovic also offers matching carbon-fiber diffusers and mirror caps to complete the look.

Borla ATAK vs Akrapovic: Which M8 Exhaust Is Right for You?

The Borla ATAK is the loudest street-legal M8 cat-back and the smart value play at $3,614.99 — less than a third of the Akrapovic's price. Built from premium T-304 stainless steel and backed by Borla's Million-Mile Warranty, the ATAK Gran Coupe system uses a dual 3.5-inch split rear exit, active exhaust valves with a dual 3-inch loud path and dual 2-inch quiet path, a Merge X-pipe, and Borla's Polyphonic Harmonizer and SwitchFire technology to hit the highest decibel level in Borla's street lineup without cabin drone. It exits through dual 5-inch round carbon-fiber tips with black anodized centers.

The decision comes down to priorities. Choose the Akrapovic if weight savings, titanium construction, and a refined-yet-aggressive tone are worth the premium and you want the exact fitment for a coupe or convertible. Choose the Borla ATAK if you drive a Gran Coupe, want the loudest street-legal note for the money, and value the Million-Mile Warranty. It is worth being clear-eyed about the value gap: the Borla delivers roughly 80% of the sensory upgrade — the volume, the presence, the active-valve control — for under a third of the Akrapovic's price. What the extra money buys is titanium instead of stainless steel, 22.5 lbs of real weight loss, hand-finished carbon tailpipes, and the badge cachet that comes with the best-known name in performance exhaust. For a car that already costs six figures, many M8 owners decide the Akrapovic is the correct answer; for owners who want the sound and would rather spend the difference on wheels or a tune, the Borla is the smarter buy. Here is how the M8 exhaust options stack up:

Do You Need the Akrapovic Link Pipe Set?

The Akrapovic Evolution Link Pipe Set is an optional titanium add-on for the F93 Gran Coupe that increases volume and sharpens throttle response when paired with the Evolution Line cat-back. At $3,662.30 it is a way to dial the sound up further for owners who already run the full titanium system and want a more track-focused character. It is not required — the cat-back is a complete system on its own — but it is the finishing piece for buyers chasing maximum sound.

Complete the Build: KW V4 Coilovers for the M8

An exhaust wakes up the M8's voice; coilovers sharpen the way it drives. The KW Coilover Kit V4 for the 2019+ BMW M8 (F93), including the M8 Competition, is a track-capable, adjustable-damping system priced at $8,774.00. It replaces the factory adaptive dampers with independently adjustable compression and rebound, letting owners fine-tune the 4,300-plus-pound M8 for canyon roads or track days without giving up street comfort. Pairing the KW V4 with the Akrapovic exhaust is the classic sound-plus-handling combination our Tampa customers build toward.