Service Completed: Custom Exhaust Rear Valved Box

This BMW 630i came in for a premium exhaust upgrade, and we transformed the rear section with a fully custom valved backbox. The system was engineered to deliver the best of both worlds: refined and quiet with the valves closed, and a deeper, more expressive straight-six tone when opened. We finished the setup with dual single tailpipes, giving the 6-Series a classy, OEM+ look that perfectly matches its grand-touring style. A smooth cruiser when you want it—an engaging, sporty soundtrack when you don’t.

Want to hear how valved boxes work? See link below:
https://www.instagram.com/p/DQXKtB8DtxW/

 

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