Overview of Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H

The Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H exhaust system is a high-performance upgrade engineered for the BMW M135i. Crafted from high‑grade titanium and finished with striking carbon‑fibre tailpipes, this system delivers an immersive auditory experience while significantly reducing overall weight by 55.6% compared to the stock exhaust. Designed for track use, it optimizes power and torque throughout the rev range without compromising the vehicle’s emissions hardware.

Advanced Construction and Design

Built with race‑proven materials, every component of this Slip‑On Line is meticulously engineered for maximum performance. The main sections are constructed from ultra‑light titanium alloys, dramatically lowering the system’s weight. Critical parts, such as the exhaust valve housings, are precision‑cast in Akrapovic’s in‑house foundry to ensure exceptional quality and durability. High‑grade stainless‑steel link pipes guide the exhaust gases efficiently, while a specially engineered Y‑split minimizes flow noise without compromising the pressure pulse distribution. This design yields a rich, high‑frequency tone—particularly noticeable during gear shifts—while maintaining a deep, full-bodied sound that enhances the engine’s natural character without introducing any drone.

Dynamic Sound Tuning of Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H

The Slip‑On Line is tuned to provide a superb auditory experience. A cast exhaust valve, integrated into the system, places special emphasis on high frequencies, delivering crisp, sharp tones during gear shifts and dynamic driving. The result is a sound that not only highlights the aggressive nature of the BMW M135i’s engine but also offers comfort during everyday driving. Whether cruising at low revs or launching into high‑performance track sessions, the system’s refined tuning ensures that the exhaust note is always engaging.

Performance Enhancements

In rigorous back‑to‑back runs on the Akrapovic dyno against a standard stock exhaust, the Slip‑On Line achieved notable performance improvements:

• Power Gain: +3.3 kW (approximately +4.5 hp) at around 5350 rpm
• Torque Increase: +5.9 Nm at approximately 5300 rpm
• Weight Reduction: The system weighs only 7.5 kg compared to the stock 16.9 kg—a reduction of 9.4 kg or 55.6%
  These enhancements not only boost the engine’s responsiveness and throttle dynamics but also significantly improve the vehicle’s overall power‑to‑weight ratio.

Installation and Fitment

This exhaust system is designed as a slip‑on, cat‑back solution that requires the stock exhaust to be cut for installation. It mounts directly onto the existing downpipes while retaining the catalytic converters, ensuring that the emissions system remains intact. Installation typically takes around 210 minutes and should be performed by a professional experienced with high‑performance systems.
Fitment Notice: The system is intended for vehicles equipped with an Otto/gasoline particulate filter (OPF) and is optimized for track use only.

Optional Upgrades of Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H

For enthusiasts seeking even more refinement, the optional Akrapovic Sound Kit (Product Code: P‑HF1312) can be added to further control and customize the exhaust tone. This kit allows for adjustable sound settings from within the cockpit, ensuring that the auditory experience can be tailored precisely to your preference.

Conclusion of Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H

The Akrapovic BMW M135i (F40) OPF/GPF Slip-On Line S-BM/T/15H exhaust system is a masterpiece of performance engineering. With its ultra‑light titanium construction, precision‑engineered Y‑split, and cast exhaust valve, it delivers enhanced power, torque, and a dynamic, high‑frequency sound that transforms your driving experience. Achieving a remarkable 55.6% weight reduction, this system optimizes your BMW M135i for both track performance and spirited driving. Embrace the advanced technology and unrivaled craftsmanship of Akrapovic and experience a level of performance that is truly extraordinary.