[Frosty_M4]

Hey All,

Happy new year!!

Just took delivery of my 2024 M4 XDrive and looking to lower it on some adjustable springs. Torn between AST and KW. Any advice or personal experience would be appreciated as I try to decide. Definitely want to go the adjustable route so I can fine-tune it.

I want to keep this car dailyable but still fill in that wheel gap. Should I request a certain mm drop when I take it on for the install? Or is it really easy for the shop to raise/lower it until I tell them it’s the right height.

I’ve gone through about every forum post here before y’all say “search bar” haha.

Thank you for the advice !!

[TopJimmy]

KW was selected by BMW to make their MP-HAS, so KW gets my vote over AST. I’m picking MP again for my G ride, since it was great on my F80.

[g82mamba]

I have Ast springs and I would say there perfect there a nice fitment and doesn’t rub and handles well

[TopJimmy]

Originally Posted by g82mamba

I have Ast springs and I would say there perfect there a nice fitment and doesn’t rub and handles well

Would you say your ride got softer or more firm after switching from stock springs to AST?

[GabesSlowM4]

I have KW springs. No issues at all. Rides stiffer then stock but that's to be expected.

[mike@x-ph.com]

My vote is H&R VTF thats what i used on both my G82 (RWD and X-drive) but if i have to pick between AST and KW, i'd go with AST. Looks better in my opinion

[GolfCoyote]

I think a lot of people get waaaay to hung up on having the adjustable height. I’ve had coilovers on multiple cars in my life, and 99% of the time I set the height and never touch it again.

If it was my money I’d just buy normal lower springs (which is what I did this time around).

[Boogie2121]

AST springs is my choice but I would go AST has next choice after that.

[Frosty_M4]

Originally Posted by GolfCoyote

I think a lot of people get waaaay to hung up on having the adjustable height. I’ve had coilovers on multiple cars in my life, and 99% of the time I set the height and never touch it again.

If it was my money I’d just buy normal lower springs (which is what I did this time around).

That's a good point. However, I do plan on getting wheels in the future and would like to have the freedom to adjust ride height in case fitment changes.

[GabesSlowM4]

Originally Posted by Frosty_M4

That's a good point. However, I do plan on getting wheels in the future and would like to have the freedom to adjust ride height in case fitment changes.

Same, I change wheels as much as I change underwear so having HAS is awesome for fitment.

[GolfCoyote]

Originally Posted by Frosty_M4

That's a good point. However, I do plan on getting wheels in the future and would like to have the freedom to adjust ride height in case fitment changes.

Makes sense, though I will say unless you're increasing/decreasing the diameter of the tire it still shouldn't matter too much. Where I can see this being useful is if you live somewhere that gets a bit of snow, having the freedom to raise the car would be a pro for sure.

I get the feeling most of the guys who opt for the HAS kits are just getting it because everyone else is lol.

[specced]

They’re gonna be really similar. I believe AST has slightly stiffer rates.

The biggest benefit of AST is the adjusting is nicer, it’s a single tool, versus the rings and wrenches like a traditional coilover, that tend to seize up overtime.

[mistasleepi]

AST HAS goes lower then the KW HAS if that matters.

[adam12hicks]

I have the BMW HAS kit and love it. I’m surprised at how LITTLE harshness it added. The ride is honestly perfect as is the drop for me. No rubbing on 15/12 future classic spacers either. BMW kit built by KW so I’d go that way. With only 1300 miles on my car I felt like the BMW part (and BMW part number decal they give you for the door jam) MIGHT help get me out of jail with future service visits if they were suspension related.

[M3SQRD]

I’d go AST ALS over KW HAS because it has a higher rear height adjustment. Most HAS kits are setup with too much forward rake to set the front and rear gaps the same. Front fenders are physically larger openings so settling the tire finger gap the same lowers the front too much. I’d get the car corner balanced after installing the kit and stick with the final corner balanced height adjustments (each corner will have a different ride height).

Front is easy to adjust the height but the rear isn’t as easy and you have to drop the lower control arm to adjust rear ride height. Having target ride heights helps by presetting the height adjusters.

[Game]

Happy with my AST ALS on my G87. Cheaper too.