I'll be adding KW V1's. Figured I'd go ahead and upgrade the rear control arms with either one of these. Thoughts, opinions, user experience?
Thanks!!

 

Spoke with a vendor the other day who sells several brands. They're preference was the H-Sport. I have no other useful info for you and no personal experience, although I will soon be in the market for some as well.

 

I have the Alta's, they seem to be a quality part. I was also looking at the H-sports, but ended up going with the Alta. Between the two I don't think you could go wrong.

 

You might want to look in to the MINIMadness ones as well.

 

From the talking to vendors it sounds like the R53 ones work with the R56. Just FYI and someone correct me if I'm wrong.

 

I'm going to give the Alta products a try. The powder coated control arms look great, and there have been very positive reviews of the 19mm rear sway bar. I will buy both. There was some discussion some time back about squeaking from the control arms. Hopefully that issue has been fixed with the "V2" control arms.

 

I just noticed on the H-Sports that they have a zerk nipple for greasing the bushings! That is a bonus, I might sell my Alta's just for that main purpose!

 

That is cool.

 

There is a huge difference in terms of NVH between the spherical bearing arms and rubber bushed arms. Don't expect silence and comfort if you go spherical...and also don't expect them to last through harsh winters with salted roads. Helix has booted spherical arms which should hold up better in wet/salty weather, however nothing maintains stock ride comfort like rubber bushings [like H-Sport and Ireland, for example]

All that said, you can lower the R56 about 1.8" and correct the rear camber with the factory eccentric bolts back to about -1.3-ish degrees.