Milltek Sport Axle-Back Back Box/Muffler Delete, Non-Valved, GT-80 Cerakote Black 80mm Tips - BMW 1 Series 125i F20/F21 (B48) 2016-On - Rear Silencer Bypass, Twin Left Exit - 3 & 5 Door Hatch Performance Exhaust Upgrade

Milltek Axle-Back Back Box Delete with 80 mm Ceramic Black Tailpipes for BMW 125i F20 F21 B48 2016+

Want your 1 Series to sound the way it should? This Milltek axle-back back box delete unleashes a deeper, crisper tone on the B48-powered 125i while keeping a clean OEM-plus look. It replaces the rear muffler section to free up flow and deliver a louder, sportier soundtrack, finished with stealthy 80 mm ceramic-coated satin black tailpipes that suit the factory twin left exit perfectly.

Turn up the character

• Back box delete for a stronger, more engaging exhaust note with real presence
• Fixed-sound setup with no valve control for consistent tone all the time
• Noticeably more volume and clarity outside, refined in-cabin for daily use
• Designed to complement the B48 2.0 turbo characteristics without harsh drone

Built to last, made in Britain

Crafted in the UK from premium T304 stainless steel with smooth-radius bends for efficient gas flow, accurate fitment and long-term durability. The 80 mm matte black ceramic-coated tips resist heat and staining for a tough, understated finish that looks factory fresh but far more purposeful.

Fitment

• BMW 1 Series 125i, F20 and F21 hatchback
• 3-door and 5-door models
• Engine: B48 petrol
• Model years: 2016 onward
• Tailpipes: 80 mm satin black ceramic-coated tips
• Outlet style: suits the standard twin exit on the left side
• Configuration: axle-back rear muffler delete, no valve actuator

Why 125i owners choose this setup

Clean look, premium materials and a punchy motorsport-inspired sound without going over the top. We have installed this system for customers and on our own builds, and feedback has been consistently positive for tone, fit and overall quality. If you want a sharper, more exciting 125i with an OEM-plus appearance, this is a brilliant choice.

Professional fitting available

Direct fit to the factory system at the rear section. For the best result and alignment, professional installation is recommended.

Book your install with MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

Helpful notes

Compatible with B48 engine models only. If you are unsure about compatibility, contact us and we will be happy to help.

Search-friendly terms customers use

BMW 125i back box delete F20, BMW 125i back box delete F21, 125i axle back exhaust, BMW 1 Series 125i B48 exhaust upgrade, BMW 125i rear muffler delete, 80 mm black exhaust tips BMW 125i, ceramic black tailpipes BMW F20, twin left exit tailpipe BMW 1 Series, performance exhaust 125i B48, Milltek axle back BMW 125i, BMW 125i loud exhaust option, BMW F20 F21 B48 sound upgrade, BMW 1 Series 125i sport exhaust, BMW 125i hatchback exhaust system, UK made stainless exhaust BMW 125i.