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 ·
BMW M340i mods and performance parts
1,235 parts for the G20 BMW M340i (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 G20 M340i (B58 3.0L) category. Many parts fit both rear-wheel-drive and xDrive cars, but not all. Confirm drivetrain, model year and options on the retailer page before ordering.
Exhaust
BMW M340i exhaust systems →
69 parts from 13 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.
BMW M340i downpipes →
15 parts from 10 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.
BMW M340i exhaust tips →
89 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
BMW M340i intakes →
47 parts from 19 brands. Replacement intake systems, airboxes and filters.
BMW M340i charge pipes →
9 parts from 6 brands. Replacement pipes for the pressurised intake tract between the turbocharger, intercooler and throttle body.
BMW M340i tunes & engine software →
37 parts from 12 brands. Engine and transmission software, flash tuners, piggyback modules and throttle controllers.
BMW M340i intercoolers & charge cooling →
7 parts from 6 brands. Intercoolers, heat exchangers and related charge-cooling parts.
BMW M340i turbochargers & turbo parts →
28 parts from 8 brands. Turbochargers, turbo kits, inlets and related hoses.
BMW M340i fuel & ignition →
44 parts from 17 brands. Fuel pumps, injectors, flex-fuel kits, ignition coils and spark plugs.
BMW M340i cooling upgrades →
30 parts from 7 brands. Radiators, oil coolers, expansion tanks and hoses sold as upgrades.
BMW M340i engine & mounts →
55 parts from 19 brands. Engine and transmission mounts, catch cans, pulleys and internal engine parts.
BMW M340i drivetrain →
4 parts from 4 brands. Axles, driveshafts, differentials and limited-slip units.
Suspension
BMW M340i coilovers →
22 parts from 7 brands. Height-adjustable spring and damper assemblies.
BMW M340i lowering springs →
7 parts from 7 brands. Shorter springs that lower ride height on the factory or aftermarket dampers.
BMW M340i suspension & chassis →
46 parts from 17 brands. Sway bars, control arms, bushings, strut braces, dampers and alignment parts.
Brakes
Wheels
Exterior
BMW M340i front lips & splitters →
8 parts from 5 brands. Front lips and splitters that attach to the lower edge of the front bumper.
BMW M340i spoilers & wings →
16 parts from 7 brands. Trunk spoilers, roof spoilers and wings.
BMW M340i rear diffusers →
9 parts from 5 brands. Rear diffusers and rear bumper trim.
BMW M340i exterior & aero →
41 parts from 11 brands. Grilles, mirror caps, side skirts, emblems and other exterior parts.
Interior & Lighting
BMW M340i interior →
101 parts from 22 brands. Shift paddles, pedals, trim, steering wheels and floor mats.
BMW M340i lighting →
5 parts from 3 brands. Bulbs, lamps, side markers and lighting modules.
BMW M340i track & accessories →
37 parts from 11 brands. Track-day safety items, tow hooks, care products and general accessories.
BMW M340i guides
Modification & Performance Guides · BMW
Best Mods for a Stock BMW M340i: Organized by Goal - M340i Mods
Explore the best first m340i mods, organized by goal, to enhance your BMW M340i's performance and style without breaking the bank.
By Lee Shahin ·
Explore: Modification & Performance Parts
Modification & Performance Guides · BMW
BMW M340i Lowering Springs vs Coilovers for Daily Driving
Compare BMW M340i lowering springs and coilovers for daily driving, covering ride quality, handling, installation complexity, and long-term maintenance costs.
By Lee Shahin ·
Explore: Modification & Performance Parts
Modification & Performance Guides · BMW
BMW M340i Wheel Fitment: Diameter, Width, Offset, Tires
BMW M340i Wheel Fitment guide covering factory wheel diameter, width, offset specifications, compatible tire sizes, and xDrive differences.
By Lee Shahin ·
Explore: Modification & Performance Parts
Modification & Performance Guides · BMW
BMW M340i Front Lip: ABS vs Polyurethane vs Carbon Fiber
Compare BMW M340i front lip materials: ABS, polyurethane, and carbon fiber. Learn fitment requirements, durability differences, and installation considerations.
By Lee Shahin ·
Explore: Modification & Performance Parts
Modification & Performance Guides · BMW
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.
By Lee Shahin ·
Explore: Modification & Performance Parts