B4's will be very close to stock in terms of firmness. I put them on my 2005 330xi and they are just ever so slightly firmer than stock. Any reason you're changing springs? Stock springs usually last a long time. Struts and shocks do not affect ride height. Springs and strut mounts affect ride height. Suggest you do some searching on this website as there were several threads about using different strut mounts to compensate for slightly higher ride heights due to different manufacturers.

 

Currently 130k miles on my BMW. Might be best just to replace the springs anyways? Probably be best for my car to set at standard height since Dallas roads are horrible.

 

Unless springs break, don't change them. If there's surface rust, just sand it and paint.
Make sure to change the spring rubbers, those deform over time.
Rear springs. order the rubber pads that suit your ride requirements. Ranges from 5mm to 25mm thickness (E36 Eastern European rough road package 25mm IIRC).
Get new mounts front and rear. Front E90 Xdrive mounts seem to be the most durable; there's threads about that. Rear mounts, get a style similar to Rogue Engineering. They're easier to install and double as reinforcement plates.

 

i am about 1500 miles on eibach springs and b4 struts

i may have to increase the rear rubber or make some sort of shim as my car seems lobsided right now

i would go with b4 again in a heartbeat!!

edit: agreed wtih saber
got the e90x front mounts (also get reinforcement plates theyre like 27 bucks from autohaus)

here's the part i ordered couple months back:

• 9 Items
• Price
• Quantity
• Total

BMW Shock Absorber
Sachs
$78.99

$157.98

BMW Strut Assembly
Sachs
$122.99

$122.99

BMW Strut Assembly
Sachs
$123.99

$123.99

BMW Strut Mount
Sachs
$40.19

$80.38

BMW Foam Bump Stop
Febi Bilstein
$9.19

$18.38

BMW Shock Mount
Lemforder
$11.19

$22.38

BMW Shock Mount Gasket
Elring
$1.19

$2.38

BMW Shock Absorber Bump Stop
Febi Bilstein
$10.09

$20.18


i also got pads for front and rear but that was separate order because im a dummy and cant pick everything at once

BMW Spring Pad
FEB-174363

Price
$7.69
QTY
2
Write Review


Buy Again

BMW Spring Pad
FEB-174362

Price
$7.19
QTY
2
Write Review


Buy Again

BMW Coil Spring Shim
BMW-33531094518

Price
$12.19
QTY
2


hopefully this help you! i have a 2004 ci as well, but vert.

 

i am about 1500 miles on eibach springs and b4 struts

i may have to increase the rear rubber or make some sort of shim as my car seems lobsided right now

i would go with b4 again in a heartbeat!!

edit: agreed wtih saber
got the e90x front mounts (also get reinforcement plates theyre like 27 bucks from autohaus)

B4s ordered, can't wait to install em and finally stop slamming the ground every bump!

 

I just replaced all suspension parts on my car. Went with Bilstein B6s with stock "sport" springs all around and have to say, the ride is really good. Actually, it feels very close to stock and car ride hieght has not changed at all either. Really happy with the swap out.