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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-01-2007, 12:07 PM   #1
jpr
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Bilstein Shocks Explained

To address recurring questions about Bilstein shocks, here's a quick overview of the 3 product lines they offer.

B4 Gas - aka Touring - This is twin tube gas pressurized shock with a black painted body. Per Bilstein, this is intended as a straight replacement for the OEM shock with the same damping force. The catch is, I believe this is intended as a replacement for the non-sport suspension OE dampers, rather than the sport suspension OE dampers. This is the one to choose if you do not have or do not want an OE sports suspension ride.

B6 Sport - aka Heavy Duty - This is a monotube gas pressurized shock with a yellow paint body. Per Bilstein, it is about 20% stiffer than the OE shocks, but as with the B4's it is uncertain exactly to which version of OE shock they are comparing it. My guess is that this is in comparison to the non-sport supension shocks, and it is somehwhat stiffer than the ZSP shocks and closely equivalent to the ZHP shocks, Bilstein states this shock is suitable for applications which lower the car up to 20mm (for reference, OE sport suspension lowering is 15mm). This is the one to choose if you have the OE sports or ZHP suspension and do not intend to change it.

B8 Sprint - aka Sport - This is essentially the same shock as the B6 but with a shortened body. Per Bilstein, it is suitable for lowering applications of up to 60mm, but really workd best in the 40~50mm range. This is the one to choose if you have almost any sort of aftermarket springs, which in almost all cases lower the car by at least 30mm.

All info sourced from here - http://www.bilstein.de/cms_website/english/Home/
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Old 11-01-2007, 01:43 PM   #2
Hrvat
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Thanks bud. Another very informative post. A true E46 Fanatic!
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so 2004 bmw's dont come with a diff?
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Old 11-20-2007, 08:20 AM   #3
e4sixxx
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thanks i'm going to go with the b8's
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Old 11-20-2007, 11:17 AM   #4
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Great post! We need more like this! Thanks!
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Old 11-20-2007, 12:32 PM   #5
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Originally Posted by spivey3 View Post
Great post! We need more like this! Thanks!
use the search
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Old 09-16-2014, 03:06 PM   #6
Whitetiger325Ci
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Finally found an answer! I have one rear shock out and I just need a quick replacement for the time being and will do a suspension overhaul later. I have ZSP on my 2005 325Ci and didn't know if I should get sport or HD because I wasn't sure if the OEM sport springs were "lowered" or not. So I will go with a set of B6 for the rears (need to replace both at the same time anyway). Car has 98000 miles and springs are still good. Want to get a Bilstein B12 Pro-kit later. Or mabye upgrade to a 330Ci ZHP when I trade the 325Ci in.
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