BMW 420i M Sport – Backbox Delete Upgrade at MIJ Exhaust! 🔥

This BMW 420i M Sport came into MIJ Exhaust for a backbox delete, giving the car a more aggressive sound while keeping a clean and OEM+ style finish. 😎💨

We removed the factory backbox and replaced it with a custom setup, enhancing exhaust flow and delivering a deeper, sportier tone without being overly intrusive for daily driving.

The system retains a single exit layout, finished with twin tips, maintaining a factory-inspired look but with a much stronger road presence.

We’ve included before and after images so you can clearly see the transformation from the original setup to the upgraded rear section.

Check out the link below to hear the sound test and experience the difference this setup makes. 🎥🔊
https://www.instagram.com/p/DVqLzimgc-o/

The result is a sharper, more engaging exhaust note paired with a subtle yet effective visual upgrade.

Another clean and tasteful exhaust modification completed at MIJ Exhaust. 🔧🔥

Why Choose a Custom MIJ Exhaust?

No two vehicles—and no two customers—are alike. That’s why every exhaust system we build is custom-made on the vehicle for the perfect fit, tone, and performance.

Whether you’re after:

  • A sportier, more aggressive sound,
  • A performance-focused setup, or
  • A refined, OEM-style tone,

    • —we tailor the design specifically to your goals.

     

    More Than Just Custom Builds

    We provide all types of exhaust services, including:

  • Exhaust repairs and leak fixes
  • Section replacements
  • Welding cracks and fault correction
  • Tailpipe upgrades and cosmetic enhancements
  • Small adjustments and one-off jobs

    • No job is too small.

     

    Want to Know How We Build Your System?

    Learn more about our process on our Exhaust Construction page: https://www.mijexhaust.com/exhaust-construction/

     

    Get Your Personalised Quote

    Use the enquiry form on the side of this page, and our team will get back to you with a tailored estimate.

     

    See More of Our Work

    Check out our social channels for videos, sound clips, and behind-the-scenes content:

    Instagram: https://www.instagram.com/mijperformanceexhaust/
    Facebook: https://www.facebook.com/MIJPerformanceExhausts
    YouTube: https://www.youtube.com/@MIJPERFORMANCEcom/shorts
    TikTok: https://www.tiktok.com/@mij_performance