ECS Tuning Resonator Delete G05/G06/G07 40i

Unleash the full potential of your B58 while retaining the factory-valved rear muffler. Our ECS Resonator & Center Muffler Delete replaces the restrictive factory center section with lightweight, high-flow 304 stainless steel tubing, unlocking a deeper, more aggressive tone and improved exhaust flow.

This direct bolt-on upgrade sheds approximately 8 lbs, smooths exhaust routing, and eliminates factory bottlenecks for improved performance and a sharper sound. Fully compatible with the stock downpipe and rear muffler, it’s an easy, reversible way to add excitement to your X5 40i without replacing the entire system.

Features & Benefits:

• Deeper, more pronounced exhaust note with added burbles, without added drone
• Retains factory valved muffler for OEM functionality
• ~8 lb weight savings by removing the center resonator
• Durable brushed 304 stainless steel, TIG-welded construction
• Direct bolt-on with factory clamps and mounting provisions
• Reversible installation at factory cut point
• Designed to clear OEM braces for a hassle-free fit

Kit Includes:

• Front & mid-pipe exhaust sections
• Factory-style downpipe clamp
• Rear muffler sleeve clamps

Design Specs:

• 1.25mm wall brushed 304SS tubing
• Two-piece 80mm exhaust pipe
• Fabricated sheet-metal hangers
• 304SS sleeve and Accuseal clamps with slip joints for adjustability

Installation and Support:

• Installation is as easy as cutting, placing into position, and clamping! Full installation instructions can be found under the "Installation Tab" above. 
• Tools you might want for the job:
  • Exhaust pipe cutter - ES3106581

Bring out the sound, performance, and character your B58 was meant to deliver without compromise.

Product Development:

• The ECS B58 40i Resonator Delete was designed, engineered, tested, and quality inspected by the Research and Development team at ECS Tuning. Nothing but the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing. Performance data metrics are collected utilizing Mustang AWD 500 SE in-ground dyno and in-house Superflow SF-750 Flowbench.