Akrapovic BMW M3 (G80) / M4 (G82/G83) Slip-On Line (Titanium) 2021-2027

The Akrapovič Slip-On Line (Titanium) (S-BM/T/40H) is a valved, rear-section exhaust for the BMW M3 (G80) and M4 (G82/G83). It replaces the factory mufflers with a lighter titanium system that adds power and torque, cuts 18.2 lb from the back of the car and gives the S58 engine a richer, deeper voice. This is Akrapovič's current part number for this system; it supersedes S-BM/TI/33H and S-BM/T/21H.

Performance and Sound

On the Akrapovič dyno, against a BMW M4 Competition with the stock exhaust, this system gained 10.7 hp at 6,000 rpm and 10.3 lb-ft at 5,000 rpm. No ECU remap is needed. Two valves and the matching Akrapovič control kit let the exhaust stay smooth and refined at cruise, then open into a deep, sporty tone when you drive harder, so one system covers daily driving and track days.

Materials and Construction

The system is made from high-grade titanium, and its collectors are cast in Akrapovič's own titanium foundry. At 33.7 lb it is about 35% lighter than the stock exhaust. The carbon-fibre tailpipes are ordered separately and finish the install; they come in Akrapovič's octagonal design or a classic round design. Photos of the system show it with optional tip sets fitted.

Akrapovič was founded in Slovenia in 1990 by Igor Akrapovič and built its name in motorsport before moving into road-car exhausts. That racing background shows in the attention to weight, flow and build quality.

Features

• High-grade titanium construction with collectors cast in the Akrapovič foundry
• Akrapovič dyno result: +10.7 hp at 6,000 rpm
• Akrapovič dyno result: +10.3 lb-ft at 5,000 rpm
• Weighs 33.7 lb (15.3 kg), 18.2 lb (35%) less than the stock exhaust
• Valved design for a quiet cruise and a deep sound under load
• No ECU remapping needed
• Fits OPF and non-OPF cars, including xDrive, Competition, CS, CSL and M4 Convertible

What Is Included

• Akrapovič Slip-On Line (Titanium) S-BM/T/40H
• The Akrapovič tail pipe set you choose in the Exhaust Tips menu, if any

Required Parts (Sold Separately)

• Akrapovič Tail Pipe Set (Carbon): choose Carbon Classic Round (TP-CT/68), Carbon Octagonal (TP-CT/69) or Chopped Carbon Octagonal (TP-CT/73/CF) in the Exhaust Tips menu, or select Not included if you already have a set. Tips are required to complete the system and are not in the box.
• Akrapovič Control Kit (required): P-HF1383 for non-OPF cars and OPF cars with the S58B30A/B engine. For the S58B30C engine, order P-HF1736 (sold separately; not currently stocked).

Specs

• Part number: S-BM/T/40H (supersedes S-BM/TI/33H and S-BM/T/21H)
• Brand: Akrapovič
• Material: titanium
• Exhaust type: slip-on (rear section), valved
• System weight: 33.7 lb (15.3 kg)
• Weight saving vs. stock: 18.2 lb (8.3 kg), 35%
• Installation time: about 240 minutes
• Shipping dimensions: 56 x 26 x 24 in (142 x 66 x 61 cm)
• Shipping weight: 40 lb (18.1 kg)

Fitment Notes

• Fits the US-market BMW M3 and M4 listed below.
• Professional installation is recommended.
• Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.