KW HAS Kit Explained: Lowering Without Losing Your Adaptive Dampers
Every owner of a modern performance car eventually has the same thought: this thing would look perfect about an inch lower. The wheel gap on a stock G80 M3, F90 M5, or RS3 is functional from the factory and awkward everywhere else. The question is not whether to lower the car, it is how. Most people assume the choice is between basic lowering springs and a set of coilovers, and because full coilovers are expensive, a lot of owners drift toward the cheap end of the coilover market to get the look. There is a third option that is often the smartest one on any car with factory adaptive dampers, and it is the one this guide is about: the KW Height Adjustable Spring kit, better known as the KW HAS. It gives you a genuinely adjustable drop while keeping the excellent electronically controlled dampers your car came with, and for many cars it costs less than the cheap coilovers people buy instead.
What the KW HAS Kit Actually Is
The HAS kit is deceptively simple. It is a set of KW springs paired with threaded, adjustable spring perches that install on your factory dampers. Instead of a fixed drop like a conventional lowering spring, the threaded perch lets you dial ride height anywhere within the kit's range, corner by corner, exactly like the height adjustment on a coilover. The critical difference from a coilover is what the kit does not touch: your dampers. The factory struts and shocks stay in the car, which means everything they do, including electronic damping control on cars equipped with it, keeps working exactly as designed.
That makes the HAS a precise answer to a very common situation: you are happy with how the car rides and handles, you want it lower and adjustable, and you do not want to throw away suspension hardware that is working perfectly. KW builds HAS applications for a wide range of performance cars, and each kit is engineered around that specific chassis rather than being a universal part.
Why Keeping Your Factory Adaptive Dampers Matters
Here is the part of the decision most people underrate. If your car has adaptive dampers, BMW's Adaptive M suspension and EDC, Audi's magnetic ride and DCC-style systems, AMG's Ride Control, Porsche's PASM, you are sitting on some of the most sophisticated damper hardware ever fitted to a road car. These dampers adjust firmness continuously, give you real differences between comfort and sport modes, and were tuned by the factory specifically for your chassis. They are also genuinely expensive, often well over a thousand dollars per corner to replace.
Swap those dampers for coilovers and three things happen. First, you physically remove and shelve that hardware. Second, you usually need cancellation modules to stop the car from throwing suspension fault codes, and your drive mode buttons stop changing anything about how the car rides. Third, you have replaced a continuously variable, factory-tuned damper with a passive one, and unless you spent serious money, probably a less capable one. The HAS route avoids all three. The car lowers, the electronics stay happy, and comfort mode still means comfort mode on a rough road.
The Cheap Coilover Trap
This is where the HAS makes its strongest case, so it is worth being blunt. The budget coilover market exists because people want two things, a lower car and height adjustability, at the lowest possible price. But look at what a bargain coilover actually is: a set of springs plus a set of dampers built down to a price. On a car with adaptive suspension, that purchase means paying money to replace the best dampers the car will ever have with the cheapest dampers on the market, then paying again for cancellation kits to silence the errors, and living with a harsher, less controlled ride than stock. The car sits lower, and it is worse to drive.
The HAS flips that math. It delivers the two things the budget coilover buyer actually wanted, the drop and the adjustability, while keeping the factory damping that no budget coilover can approach. And because you are only buying springs and perches rather than a full damper assembly, the HAS typically costs about the same as, and often less than, the mid-tier coilovers people settle for. If the goal is a lower car that still rides and drives like the car you paid for, the HAS is not the compromise option. The cheap coilover is.
HAS vs Lowering Springs vs Coilovers
| Lowering Springs | KW HAS | Full Coilovers | |
|---|---|---|---|
| Ride height | Fixed drop, no adjustment | Adjustable within range, corner by corner | Adjustable within range, corner by corner |
| Factory adaptive dampers | Retained, but working outside their designed range | Retained and fully functional | Removed, cancellation modules usually required |
| Ride quality | Close to stock, sometimes harsher | Near stock, drive modes preserved | Depends entirely on damper quality and setup |
| Damping adjustability | None | Factory electronic control | Manual on V2/V3-style kits, none on basic kits |
| Best for | Simple fixed drop on non-adaptive cars | Adaptive-equipped cars that want a dialed, adjustable drop | Worn dampers, non-adaptive cars, track-focused setups |
Popular KW HAS Applications We Stock
KW builds the HAS for most of the cars whose owners ask this exact question. Some of the most popular applications in our lineup:
- BMW M3/M4 2021-2026 (G80/G82), with the G83 Cabrio AWD covered separately
- BMW M2/M3/M4 2015-2020 (F8x)
- BMW M5 2018-2023 (F90) and M8 (F92/F93)
- BMW M3 2008-2013 (E9x)
- Audi RS3 2022-2026 (8Y) and RS3/S3 8V with EDC
- Mercedes-AMG C63/C63 S and the AMG GT range
- Porsche 911 (991) applications including PDCC and OE-lift variants
The exact adjustment range varies by application, so check the listing for your chassis, and if your car is not shown, reach out and we will confirm whether KW makes an HAS for it. Browse the complete KW lineup to find yours.
When a Full Coilover Is Still the Right Call
Honesty matters here, because the HAS is not the answer for everyone. If your factory dampers are worn out, you are already buying dampers, and a quality coilover starts to make financial sense. If your car does not have adaptive dampers, you are giving up much less by replacing the struts. And if you want manual control over damping for track work, a proper coilover with adjustable rebound and compression is the tool for the job. In those cases the answer is not a cheaper coilover, it is the right one, and our KW coilover buyer's guide walks through the V1, V2, V3, Clubsport, and DDC lines so you can match the kit to how you actually drive. The point of this article is narrower: if you have adaptive dampers you like and lowering is the goal, do not buy cheap coilovers to get there.
Installation Notes
The HAS installs like a spring swap, since the factory dampers stay in place. The suspension comes apart the same way it would for lowering springs, the KW springs and adjustable perches go in, and ride height is set on the threaded perches. Plan for an alignment afterward, as with any change in ride height, and set the height before the alignment rather than after so the geometry is corrected for where the car will actually sit. No coding, no cancellation modules, and no changes to the car's electronics are needed, which is exactly the point.
Why Buy From OneFastShop
- Authentic KW: genuine application-specific KW kits, not universal parts forced to fit.
- Fast shipping: our typical delivery time is next day on in-stock items.
- Fitment help: adaptive suspension packages vary by build date and option code, and we will confirm the correct kit for your exact car before you order.
The Bottom Line
Lowering a modern performance car is a solved problem, but most people solve it in the wrong order. If your car has factory adaptive dampers, the KW HAS kit gives you the adjustable drop you want while preserving the damping hardware and drive modes you already paid for, usually for less than the mid-grade coilovers that would throw all of that away. Save full coilovers for the builds that genuinely need them, worn dampers, non-adaptive cars, and track-focused setups, and let the HAS handle the far more common case: a great car that just needs to sit right. Find your application in the KW collection and get the stance without the compromise.
Frequently Asked Questions
What is the KW HAS kit?
The KW Height Adjustable Spring kit is a set of application-specific KW springs with threaded adjustable perches that install on your factory dampers. It provides coilover-style ride height adjustment while retaining the original struts and shocks, including electronic adaptive damping on cars equipped with it.
Does the KW HAS work with adaptive dampers like BMW EDC?
Yes, that is its core purpose. Because the factory dampers stay in the car, systems like BMW Adaptive M suspension, Audi magnetic ride, AMG Ride Control, and Porsche PASM keep working normally, with no cancellation modules, no fault codes, and full drive mode functionality.
Is the KW HAS better than cheap coilovers?
For cars with adaptive dampers, almost always. Budget coilovers replace sophisticated factory-tuned adaptive dampers with basic passive units and usually require cancellation kits, degrading ride quality to gain a drop. The HAS delivers the same lowering and adjustability while keeping the superior factory damping, typically at a similar or lower price.
How much does the KW HAS lower the car?
The adjustment range is application-specific, generally allowing anywhere from a subtle drop to a substantially lower stance, set corner by corner on the threaded perches. Check the listing for your exact chassis for its range, and set your height before the post-install alignment.
Do I need coding or cancellation modules with the HAS?
No. The factory dampers and their electronics remain untouched, so the car requires no coding, no module deletes, and no workarounds. It installs mechanically like a spring swap, followed by an alignment.
When should I buy coilovers instead of the HAS?
Choose a quality coilover when your factory dampers are worn and due for replacement anyway, when your car has non-adaptive suspension, or when you want manual damping adjustment for track use. In those cases, step up to the right coilover rather than down to a cheap one.
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