BMW M340i Exhaust: Axle-Back vs Cat-Back Comparison
Explore the differences between axle-back and cat-back BMW M340i exhaust systems, focusing on sound, drone, and daily usability for your vehicle.
By Lee Shahin ·
2016-2018 BMW 340i mods and performance parts
1,087 parts for the F30 2016-2018 BMW 340i (B58 3.0L turbo inline-six), grouped by what you are changing. Each page lists the options by brand and part number and links to the retailer for price and fitment.
Fitment: Listings are read from the retailer's F30 340i category. xDrive and rear-wheel-drive cars can use different parts. Confirm drivetrain and model year on the retailer page before ordering.
Exhaust
2016-2018 BMW 340i exhaust systems →
61 parts from 19 brands. Cat-back and axle-back systems, mufflers, tips and valve controllers. A cat-back replaces the exhaust from the catalytic converter rearward. An axle-back replaces only the rear section.
2016-2018 BMW 340i downpipes →
14 parts from 11 brands. The downpipe joins the turbocharger outlet to the rest of the exhaust. Aftermarket versions are sold with a high-flow catalytic converter or without one.
2016-2018 BMW 340i exhaust tips →
88 parts from 7 brands. Clamp-on and weld-on exhaust tips. Most are universal parts sized by inlet and outlet diameter, not made for one car.
Engine
2016-2018 BMW 340i intakes →
48 parts from 20 brands. Replacement intake systems, airboxes and filters.
2016-2018 BMW 340i charge pipes →
11 parts from 10 brands. Replacement pipes for the pressurised intake tract between the turbocharger, intercooler and throttle body.
2016-2018 BMW 340i tunes & engine software →
33 parts from 13 brands. Engine and transmission software, flash tuners, piggyback modules and throttle controllers.
2016-2018 BMW 340i intercoolers & charge cooling →
5 parts from 4 brands. Intercoolers, heat exchangers and related charge-cooling parts.
2016-2018 BMW 340i turbochargers & turbo parts →
33 parts from 12 brands. Turbochargers, turbo kits, inlets and related hoses.
2016-2018 BMW 340i fuel & ignition →
62 parts from 23 brands. Fuel pumps, injectors, flex-fuel kits, ignition coils and spark plugs.
2016-2018 BMW 340i cooling upgrades →
36 parts from 7 brands. Radiators, oil coolers, expansion tanks and hoses sold as upgrades.
2016-2018 BMW 340i engine & mounts →
70 parts from 19 brands. Engine and transmission mounts, catch cans, pulleys and internal engine parts.
2016-2018 BMW 340i drivetrain →
27 parts from 11 brands. Axles, driveshafts, differentials and limited-slip units.
Suspension
2016-2018 BMW 340i coilovers →
42 parts from 9 brands. Height-adjustable spring and damper assemblies.
2016-2018 BMW 340i lowering springs →
9 parts from 8 brands. Shorter springs that lower ride height on the factory or aftermarket dampers.
2016-2018 BMW 340i suspension & chassis →
91 parts from 22 brands. Sway bars, control arms, bushings, strut braces, dampers and alignment parts.
Brakes
Wheels
Exterior
2016-2018 BMW 340i front lips & splitters →
12 parts from 3 brands. Front lips and splitters that attach to the lower edge of the front bumper.
2016-2018 BMW 340i spoilers & wings →
16 parts from 7 brands. Trunk spoilers, roof spoilers and wings.
2016-2018 BMW 340i rear diffusers →
1 part from 1 brand. Rear diffusers and rear bumper trim.
2016-2018 BMW 340i exterior & aero →
68 parts from 15 brands. Grilles, mirror caps, side skirts, emblems and other exterior parts.
Interior & Lighting
2016-2018 BMW 340i guides
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BMW M340i Front Lip: ABS vs Polyurethane vs Carbon Fiber
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BMW M340i Intake vs Tune: Which Upgrade Should Come First?
Explore whether to upgrade your BMW M340i with an intake or tune first. Understand the benefits and risks of each BMW M340i Intake vs Tune option.
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