X3/X4 M40i B58 Turner Center Resonator Delete

Unlock the true potential of your B58 while retaining the functionality of the factory valved rear muffler. Our Turner Motorsport Center Muffler Delete replaces the restrictive OEM midsection with high-flow, TIG-welded 304 stainless steel tubing, improving both exhaust flow and acoustic character.

This direct-fit upgrade removes the factory resonator and center muffler, reducing system weight by approximately 5 lbs and eliminating built-in restrictions that limit performance. The result is a deeper, more aggressive exhaust tone with enhanced burbles, delivered without unwanted drone.

Design:

1.25mm wall brushed 304 stainless steel tubing, TIG-welded for durability
Single 80mm pipe transitioning into dual 70mm outlets
~5 lbs lighter than stock by eliminating the bulky resonator and muffler
Bolts to the factory downpipe and valved muffler using OEM-style clamps
Slip joints and 304 stainless Accuseal clamps allow fine alignment
Uses OEM hanger locations and attaches at designated cut points for ease of install and potential reversibility
Routes around OEM chassis braces with proper spacing
Kit Contents:

Front exhaust section
Mid-pipe exhaust section
OEM-style downpipe clamp
Rear sleeve clamp
Engineered for enthusiasts who want more sound, less restriction, and uncompromised fitment, this resonator delete delivers a refined yet aggressive exhaust character while letting your B58 breathe more freely.

Installation and Support:

Installation is as easy as cutting, placing into position, and clamping!
Tools you might want for the job:
Exhaust hanger removal pliers - T379176
Exhaust pipe cutter - T38545
Product Development:

Our Turner center resonator delete was designed, engineered, tested, and quality inspected by our Research and Development team at Turner. 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.