Focal Inside BMW Mini Y-ISO T-Harness for Impulse 4.320 4 Channel Amplifier
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The Focal Inside BMW Mini Y-ISO T-Harness is a plug-and-play 1m ISO wiring adapter that connects the Focal Impulse 4.320 4-channel amplifier directly to the original head unit in select BMW and MINI vehicles without a factory amplifier. It is part of the Focal Inside vehicle-specific upgrade system.
This listing is the BMW Mini harness. The Focal Inside Y-ISO T-Harness is also available for Volkswagen VW vehicles.
Key specifications
- Type: Y-ISO T-harness adapter, Focal Inside
- Compatible vehicles: BMW 2009 onwards, MINI 2009 onwards (select vehicles without a factory amplifier)
- Compatible amplifiers: Impulse 4.320, FIT 9.660
- Cable length: 1m
- Connection: ISO connectors, no soldering required
- Installation: plug and play
Inside upgrade harness
Focal's Inside system provides vehicle-specific audio upgrades including aftermarket speakers, subwoofers and the Impulse 4.320 4-channel amplifier. This T-harness is the direct link between the amplifier and the original head unit.
- Designed specifically for select BMW and MINI vehicles
- Quick and easy plug and play installation
- Direct link from the amplifier to your original head unit
Additional cables and connectors you may need
- Extension cables to connect the T-harness to the amplifier: IW-IMP-EXT150 Extension Cable
- Harness to connect the T-harness to the amplifier and subwoofer(s): IW-IMP-2.2 and IW-IMP-2.1 Harness (see the 2.2 IMP Harness and 2.1 IMP Harness)
Check your vehicle compatibility by contacting us or visiting the Focal Inside website.
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Specification
| Length | 1m (3.3ft) |
|---|---|
More specs
| |
What's Included
- Focal BMW Y-ISO Harness
Focal
About the Focal IW-BMW-YISO
From our tech experts at CEN
The Focal Inside BMW Mini Y-ISO T-Harness (IW-BMW-YISO) is a 1m plug-and-play ISO wiring adapter that connects the Focal Impulse 4.320 or FIT 9.660 amplifier directly to the original head unit in select BMW and MINI vehicles from 2009 onwards. It is part of the Focal Inside vehicle-specific audio upgrade system. No soldering is required — ISO connectors provide a clean, reversible connection.
Who it suits
This harness is for BMW and MINI owners (2009 onwards, without a factory amplifier) who are fitting the Focal Impulse 4.320 or FIT 9.660 as part of a Focal Inside upgrade. It is a necessary interface between the amplifier and the car's original head unit.
Our tech experts advise
Confirm your exact vehicle is compatible before ordering, as this harness suits only select models without a factory amplifier. You may also need extension cables (IW-IMP-EXT150, IW-IMP-2.2, or IW-IMP-2.1) to reach the amplifier mounting position. Installation is priced per vehicle — book fitting at our Nottingham workshop.
Explore the full Focal range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Focal
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Focal Inside Series
The Focal Inside offer is aimed at all drivers wishing to replace their car's original system with a hi-fi quality Plug & Play solution that integrates easily, without modifying the interior. Different configurations are available by brand (over 50 brands), by car model (1000 vehicle models).
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Frequently Asked Questions
Q: Does the BMW/MINI Y-ISO harness work in cars with a factory amplifier?
A: No. It is a T-harness for BMW/MINI vehicles without a factory amplifier, linking the original head unit to the amplifier.
Q: Which amplifiers does the BMW/MINI Y-ISO harness work with?
A: It is listed as compatible with the Focal Impulse 4.320 and FIT 9.660 amplifiers.
Q: Do I need to solder anything?
A: No. It connects to the extension cable via ISO connectors, so no soldering is required.
