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Yes, B6 are not available any longer, though.
I did a quick search, and saw one person mention the part numbers for the Bilstein are the same between the 540 and the M5. This is confirmed when looking at the current part numbers for the B8, PSS, and PSS9. I can't speak as to why Bilstein no longer lists the B6 as compatible with the M5, but you can choose to ignore that and go for the B6.

Your other options for using stock springs are the Koni Yellows and the Koni FSD. If you're looking for recommendations, I'd try the Koni FSD, just make sure that when you receive them they have 3 grooves cut into the rear shocks like the Koni Yellows. You'll need to set the clip on the lowest groove for the stock spring.
 

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Can somebody in two words explain why Bilstein B8 and stock springs is not a good combo? Someone mentioned problematic ride height in the back with stock springs? I want to refresh the absorbers, but not necessarily the springs.
Too Tall?

The B8 is a poor choice for the rear in my opinion, simply because of the uncompressed length of the spring. On paper, the B6 may be a better choice but I can't confirm that as I've never used them in person. Unfortunately, Bilstein has been unwilling to even entertain the idea that the B8 may be an incorrect fit, so don't expect any guidance from them.

People have also used the B4 as a direct replacement with stock springs and been happy, although there isn't a lot documented about it. If I recall, all E39 rear dampers are the same (I6 & V8), and the 540/M5 front dampers are interchangeable. If it fits the 540, it'll fit your car.
 

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Yeah, I think I will go with the B6 and stock springs. No budget right now for much else, and to be honest, I think this will be a suitable stock "feel" for the car. Thanks again.
 

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A lot of good information in this thread and the links you provided.

I know the Bilstein PSS and PSS9 require a 5mm spacer for the front stock wheels and tires. But, what about all the other brands like BC and KW? Do you have to run spacers on the front?

I plan to keep the M5 at stock height with the stock wheel and tire setup.
 

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A lot of good information in this thread and the links you provided.

I know the Bilstein PSS and PSS9 require a 5mm spacer for the front stock wheels and tires. But, what about all the other brands like BC and KW? Do you have to run spacers on the front?

I plan to keep the M5 at stock height with the stock wheel and tire setup.
I never heard of needing a spacer I run the B16 PSS with out
 

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I never heard of needing a spacer I run the B16 PSS with out
That's interesting. It's mentioned on the first page of this thread under cons for coilovers and in other posts I have read. It's also mentioned in the Bilstein mounting instructions for the E39 M5.

"There are no technical objections against the use of all O.E. wheel/tyre combinations except for 245/40ZR18 on 8x18 ET20. With this wheel/tyre combination spacer discs of 5mm have to be fitted on the front axle"

"The o.e. wheel/tyre combination 245/40ZR18 on 8x18, ET20 on axle 1 is only permitted with 5mm spacer discs"
 

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That's interesting. It's mentioned on the first page of this thread under cons for coilovers and in other posts I have read. It's also mentioned in the Bilstein mounting instructions for the E39 M5.



"There are no technical objections against the use of all O.E. wheel/tyre combinations except for 245/40ZR18 on 8x18 ET20. With this wheel/tyre combination spacer discs of 5mm have to be fitted on the front axle"



"The o.e. wheel/tyre combination 245/40ZR18 on 8x18, ET20 on axle 1 is only permitted with 5mm spacer discs"


I can confirm 100% this is not the case. I am sitting in mine with the stock fronts on 245s with PSS and no spacers. You do NOT need spacers to run the stock wheels.


Sent from my iPhone using Tapatalk
 

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I can confirm 100% this is not the case. I am sitting in mine with the stock fronts on 245s with PSS and no spacers. You do NOT need spacers to run the stock wheels.


Sent from my iPhone using Tapatalk
LOL this thread had me doubting my sanity, just checked stock 245/40 18s on the PSSs no spacer. I'm NOT slammed to the ground though I'd have to measure the height but I have about a 4 pubes (probably 3/16th of gap ) btw the tire and bottom of the fender.

This is my car:

https://youtu.be/3jo_UfTPIfM?t=20
 

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LOL this thread had me doubting my sanity, just checked stock 245/40 18s on the PSSs no spacer. I'm NOT slammed to the ground though I'd have to measure the height but I have about a 4 pubes (probably 3/16th of gap ) btw the tire and bottom of the fender.

This is my car:

https://youtu.be/3jo_UfTPIfM?t=20

Thanks for the feedback.

Maybe they put it in there as a precaution depending on ride height and different tire brands.
 

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Thanks for the feedback.

Maybe they put it in there as a precaution depending on ride height and different tire brands.
So I went back today and checked things out, if you're lower then stock ride by much I can see the wheels rubbing on the inner fender liner at full lock. I can also see how the spacer will push the wheel out just enough not to.
 
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