carnumber6

So would it be worth while to put in RS Rear arms into an RSA? Part numbers are
964 331 021 70
964 331 022 70

what are the differences and I am guessing they are expensive ....

ThomasC2

the bushing is a bit stiffer, not worth the money...

Blu RS

Euro RS rear axle trailing arm - approximately $1780 US per side. Euro RS front control arm - approximately $489 US per side. I obtained these price quotes a few months back thru Paragon Products 800-200-9366 but the Euro has risen a bit since then and the prices may be slightly higher. The RS rear trailing arm has two differences from the standard component; harder durometer rubber in the bushing/mounting joint as well as built-in washers in the bushing which are designed to reduce the lateral flex of the arm while in use versus the standard arm. Of course the bushing itself is built-into the component and cannot be replaced or retrofitted, although racers have been known to burn out the original RS bushing and replace it with zero-flex unibal bushings.

951fan

I had a customer ask me about replacements for these bushings and also went down the road of getting the factory arm replacement cost.

I ended up finding this part:

http://powerflexusa.com/porsche96419...pfr57-106.aspx

FYI

AVI_8

Ninemeister helped develop those powerflex bushes,

Here's some info on them

https://rennlist.com/forums/964-foru...rm-bushes.html

Vandit

I covered the installation of the Powerflex pieces in my suspension thread.
https://rennlist.com/forums/11408240-post2.html

I was kinda annoyed that only a few weeks after I purchased my set, Poweflex announced the higher performance (stiffer durometer poly) Black Series bushings.

Bill Verburg

Elephant has bush for both the front and rear suspension of a 964
Elephant 964 suspension bushes

For mostly street use the sport rubber are the same as the 964 RS used originally, for mostly track use the mono-ball kits are the way to go.