Milltek ValveSonic+ Valved/Switchable Cat-Back Sports Exhaust for BMW 1 Series M135i (F20/F21, 3 & 5 Door) 2012–2020 | Active Flap-Controlled Performance Catback | T304 Stainless Steel | UK Made | SSXVS001

Milltek ValveSonic+ Cat-Back for BMW M135i F20 F21 2012 to 2020 - Part Number SSXVS001

Give your BMW M135i the soundtrack and response it deserves with Milltek’s ValveSonic+ switchable cat-back system. Tailor the tone at the touch of a button with a flap-controlled rear section that delivers a calm, refined note for commuting and a fuller, more aggressive sound for spirited driving. Built in the UK from premium T304 stainless steel, this high quality system is a direct replacement from the catalytic converter back for the 1 Series M135i hatchback, F20 five-door and F21 three-door, model years 2012 to 2020. Part number SSXVS001.

Why this Milltek system stands out

• Valve-controlled sound levels - quiet when you need it, sporty when you want it
• High grade T304 non-magnetic stainless steel for long-term corrosion resistance
• Mandrel-bent pipework for smooth, consistent flow and sharper throttle response
• Carefully engineered acoustic tuning for a deep, engaging tone with minimal cabin boom
• Precise fitment for BMW M135i F20 and F21 - designed and hand-finished in the UK
• Direct replacement cat-back layout for easy integration with factory hardware
• Trusted performance brand with proven reliability and excellent owner feedback
• Correct product identification - Milltek ValveSonic+ SSXVS001

Real-world confidence

We run Milltek systems on our own cars and have installed them for many M135i owners. Feedback is consistently positive - customers love the switchable volume, quality craftsmanship and the uplift in character without harshness on the motorway.

Compatibility

• Model: BMW M135i 1 Series hot hatch
• Chassis: F20 5-door and F21 3-door
• Years: 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
• Type: ValveSonic+ cat-back exhaust system
• Part Number: SSXVS001

Fitting service

Professional installation recommended for perfect alignment and valve setup. Book expert fitting with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Search terms our customers use

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Order with confidence

Choose Milltek ValveSonic+ SSXVS001 for a premium UK-built cat-back that blends everyday civility with a thrilling tone on demand. Outstanding materials, precision fitment and switchable sound control make it the go-to M135i exhaust upgrade.