Service Completed: Cat-Back Exhaust Upgrade (Mid & Rear Straight Pipe with Back Box Delete)

At MIJ Exhaust Ltd, we recently upgraded the exhaust system on this SEAT Leon, giving it a sharper sound and a more engaging driving feel.

The work involved a full cat-back system, replacing the mid and rear sections with a custom straight-through setup, including a back box delete. This significantly improves exhaust flow while delivering a deeper, more aggressive tone—especially noticeable under acceleration.

The result is a sportier, freer-breathing system that enhances the overall driving experience, while still remaining perfectly usable for everyday driving.

As with all of our builds, this system was hand-fabricated in-house using high-quality T304 stainless steel and fully TIG welded, ensuring long-lasting durability, a precise fit, and a clean, professional finish.

We’ve included before and after images so you can see the transformation, along with a sound test video to hear the difference this upgrade makes.
https://www.instagram.com/p/DWV2ixRD0T1/

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