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      11-24-2010, 07:35 AM   #15
ajsalida's Avatar

Drives: 95 M3, 02 R1150GSA, 09 335xi
Join Date: Aug 2010
Location: SW USA

iTrader: (2)

Originally Posted by MJR63 View Post
Good news! AST 4100 coilovers are available via custom order through HP Autowerks for xi and x-drive vehicles!

After tons of research I decided to go with the AST 4100's once I found out they were available for xi/x-drive. I have a 2011 BMW 335i x-drive sedan. It is a custom order and takes 4 - 6 weeks but AST is building these by hand. I worked with Harold at HP Autowerks on this order. He is very knowledgeable on BMW suspensions and helped me build a custom setup. Once he gets the custom AST 4100's he is going to match them with custom swift springs. Harold thought I should go with 336lbs springs in the front and 672lbs in the rear. The stock 335 has 145lbs front and 460lbs rear. I could have went with 400lbs in the front and 784lbs in the rear but those are more for the guys who track there car. I just want crisp handling for spirited driving!

I was considering going with KW V1's or V3's but hear they squeak and have other problems. I was also considering the H&R coilovers but hear they have rusting problems.

Here is a great review of the AST's on a non x-drive 335i:

Link to AST Site:

Link to HP Autowerks:;jsess...D.qscstrfrnt05


Good to know. I was lusting over AST 4100/4200 kits the other day and dismayed no XI versions. Some good pics here: