The Airbag Man Helper Kit CR5123-CR5122 fits inside the factory rear coil springs on the Isuzu MU-X 2021+ and adds up to 400kg of adjustable load support across the pair, controlled by air pressure from 0-100psi. It levels rear sag under a loaded canopy, roof-top tent or heavy tow ball weight while leaving your unladen ride height untouched. Airbag Man backs every bag with Firestone's lifetime manufacturer warranty, and the kit ships from Australian stock with fitment support from our in-house team. It's a DIY-friendly bolt-in upgrade — no cutting, welding or drilling required.
Airbag Man helper kits use coil-insert air springs that sit inside the existing coils – add air when the load goes on to bring the vehicle back level, then let it out and the standard springs carry on exactly as before. Because each side inflates independently, you can also correct for an off-centre load like a slide-on or water tank.
They shine when the load keeps changing – a van on the towball some weekends, a loaded tray on others. Worth being clear about what they don't do: helper airbags don't increase your GVM or payload; they manage ride height and stability within the vehicle's existing ratings. If the vehicle is always loaded, upgraded springs (with airbags for the variation on top) is the better setup.
Doing the whole vehicle at once? We also stock the matching front Coil Springs and rear Coil Springs for the Isuzu MU-X 2021+.
Browse all compatible suspension parts for your Helper Kit Isuzu Mu-X 2021+ using our parts finder.
This kit works alongside your existing rear coil springs rather than replacing them, so the air pressure you run — not a fixed spring rate — is what you adjust for your constant load. Start low with an empty tray or canopy and increase pressure toward 100psi as you add a tow ball weight, water tank, dual battery setup or fitted canopy with tools. If you're carrying a heavier constant load such as a caravan or camper trailer year-round, our team can advise whether a firmer rear coil paired with this helper kit suits you better than the standard coil alone.
Fitting uses the factory coil spring location and existing mounting points, so an experienced DIY installer with basic hand tools can complete it in a home garage, though professional fitment is recommended if you're not confident working under the rear axle. Check air line fittings and bracket torque again after the first 500km, as with any new suspension-related install. Wheel alignment isn't typically required for this kit alone since ride height doesn't change, but if you've also fitted a lift kit or upgraded control arms, get the alignment checked as part of that job.
Airbag Man designs its helper kits around Australian touring and towing conditions, with bags manufactured to Firestone's specification and covered by Firestone's lifetime warranty. The brand is a regular fitment choice for tradies running canopies and tourers running camper trailers who need adjustable load support rather than a fixed heavier spring. You can view the full Airbag Man range for other coil, leaf and combination kits across popular 4WD platforms.
This kit suits MU-X owners who load up unevenly — a canopy and tools on weekdays, then a full family and camper trailer on weekends — and want to add support only when it's needed. It's also worth a look for anyone towing near their tow ball weight limit who wants to keep the rear sitting level rather than sagging. For constant heavy loads rather than variable ones, browse our broader airbag suspension range for higher-capacity options.
This kit is dispatched from Australian stock with fitment guidance from our in-house team — get in touch before you order if you're unsure which MU-X variant you have, and browse our full lift kit range if you're planning a bigger suspension upgrade alongside it.
| Make | Model | Series | Years | Engine |
|---|---|---|---|---|
| Isuzu | MU-X | All Series, Coil Rear | 2021-ON | 3.0L Turbo Diesel (4JJ3-TCX) |
Not sure if this fits your vehicle? Contact our suspension experts or check our FAQ page.
New to D-MAX and MU-X suspension? Read our guide to common D-MAX and MU-X suspension problems and how to fix them.
Genuine Airbag Man suspension from an authorised Australian dealer.
Yes, this Airbag Man Helper Kit (CR5123-CR5122) is designed specifically for Isuzu MU-X models built from 2021 onward with the factory coil-sprung rear end. It uses the factory coil spring location and mounting points, so no vehicle modification is needed. If you have an earlier MU-X or a modified rear end, check with our team via the parts finder for the MU-X before ordering.
This is a load-support helper kit, not a lift kit, so it doesn't raise your ride height when unladen. The air springs sit inside the existing rear coil springs and only add support as you increase air pressure under load. If you want a permanent ride height increase as well, look at our lift kit range for MU-X-specific options.
The kit includes two Airbag Man air springs (CR5123 and CR5122, one per side), mounting brackets and hardware, braided air lines, a T-piece fitting, and a single-path inflation valve with a protective cap. Fitting instructions are included. A compressor and pressure gauge are not included and are sold separately.
Yes, that's its main job. Increasing air pressure toward the top of the 0-100psi range adds up to 400kg of additional support across the pair, which helps counter rear sag from tow ball weight. Many MU-X owners run lower pressure unladen and increase it only when hitched up to a caravan or trailer.
Not for this helper kit specifically, since it doesn't change ride height or front suspension geometry. Control arm upgrades are more relevant if you're also fitting a front lift kit on the MU-X. If you're planning both, our control arm range is worth checking for correct geometry at ride height.
Not typically for this kit alone, because ride height and suspension geometry don't change when the bags are fitted or deflated. If you're combining this with a lift kit or other suspension changes on the same vehicle, get an alignment done as part of that separate work. When in doubt, our team can advise based on what else you're fitting.
This kit doesn't replace your rear coil spring rate — it adds adjustable air support alongside the factory coil. You control support by adjusting air pressure between 0 and 100psi rather than choosing a fixed spring rate. If you need a permanently firmer rear coil as well, speak to our team about pairing options.
Because this kit doesn't raise ride height when unladen, it won't create extra tyre clearance on its own. Tyre clearance for larger tyres on the MU-X depends on a genuine lift kit and, in some cases, wheel offset. If bigger tyres are the goal, ask our team about pairing this helper kit with a suitable lift kit.
The Airbag Man air springs in this kit are covered by Firestone's lifetime manufacturer warranty on the bag itself. Fittings and hardware are covered under standard supplier warranty terms. Keep your purchase records from 4WD Suspension for any warranty claim, and contact our team if you have questions about a specific component.
Yes. With the air springs deflated or at low pressure, the MU-X rides on its factory rear coil spring as normal, so daily driving feel isn't affected. You only add air pressure when you're carrying extra load or towing, then deflate again for unladen driving. This makes it a practical option for MU-X owners who don't carry a constant heavy load every day.
Help other 4WDSuspension users shop smarter by writing reviews for products you have purchased.
Add your favourites to cart
Log into or create your Afterpay account, with instant approval decision
Your purchase will be split into 4 payments, payable every 2 weeks
All you need to apply is to have a debit or credit card, to be over 18 years of age, and to be a resident of country offering Afterpay
Late fees and additional eligibility criteria apply. The first payment may be due at the time of purchase
For complete terms visit afterpay.com/terms
