BMW X Series E70 (2007-2013)

BMW’s E70 might look like a practical family SUV, but underneath, it’s packing some seriously impressive hardware in the N55 and M57 engines. The downside? The factory rear muffler does a great job of hiding the sound these engines are capable of. If a full cat-back system isn’t on your list right now, Turner Motorsport’s new muffler delete is a smart, budget-friendly way to wake up your E70’s exhaust note while adding a bit more attitude and style to the rear of the vehicle.

This system completely transforms the character of your X5 by replacing the restrictive rear muffler with a high-flowing, TIG-welded stainless steel setup that enhances tone, reduces weight, and maintains factory fitment and finish. Our Muffler Delete Kit features dual 3" primary tubing that transitions to adjustable 3.5" tip sections for a clean yet aggressive look. At the front, the muffler delete kit attaches to the OEM mid-pipe using factory-style sleeve clamps. The connecting pipe is installed at the factory cut location, creating an easy and reversible modification. At the rear, the included sleeve clamps enable easy adjustment and precise tip placement inside the factory rear diffuser.

FEATURES

TIG-welded dual 3" primary tubing seamlessly transitions to adjustable, twin slash-cut 3.5" tip sections, delivering a bold, refined appearance
Straightforward cut-and-clamp installation, 100% reversible
Sleeve clamps provide full adjustability for effortless alignment and precise tip positioning
Utilizes factory exhaust hangers for a clean, bolt-on installation—no cutting or drilling required
INSTALLATION & SUPPORT

Looking for installation tips? Look no further! We've assembled a start-to-finish installation guide to ensure an effortless install process. Click HERE for Installation Instructions.

If you own an M57-equipped BMW, you already know this twin-turbo diesel powerplant is an absolute torque monster. What you might also know is that all that low-end grunt and high-compression diesel vibration wreaks absolute havoc on your accessory drive system.

From the factory, both the E90 335d and E70 X5 35d utilize a rigid alternator pulley. With each cylinder's fire, the crankshaft experiences a violent micro-acceleration. Because the alternator has a heavy internal rotor spinning at high speeds, it wants to keep spinning at a constant rate. When the engine suddenly slows down (even minutely between firing cycles), the alternator fights the belt. This constant tug-of-war results in extreme stress on your engine's belt-driven components. At best, it’s an annoying, unrefined chirp at idle; at worst, it’s a ticking time bomb for your expensive harmonic balancer.

To solve this issue, many enthusiasts choose to run a clutched alternator pulley (also called an overrunning alternator pulley). A clutched pulley allows the alternator to "freewheel" or coast when the engine slows down, completely isolating its rotational inertia from the belt drive to prevent component wear. While the N52's clutched pulley (12317560483) is a straight bolt-on, the offset is incorrect for the E70 35d's accessory drive. Thankfully, our engineers designed this zinc-coated spacer to provide the precise amount of spacing needed to perfectly align the new pulley with existing belt drive components.