QUOTE(HIPPIEKILLER @ Jun 12 2021, 09:31 AM)
What is the adventage of the aluminum cross member?
Is it mandatory for sway bar?
If so, do you have another?
Thanks!
Porsche used an aluminum crossbar in their 911 race cars in the 70's and at some point, moved to the aluminum piece in the production cars. It's about 7 lbs lighter. The sway bar is an underbody bar as compared to the through body bar. Similar story to above. I think the underbody bar is easier to remove and replace but probably not as adjustable as a through the body bar. It doesn't require you to cut holes in the body but you do need the correct mounting pieces on your A arms.
The aluminum cross member is usually available for $200-300. You will need two support straps that attach separately and ether make or use a 911 style protective cover.
I'm not saying one type of sway bar is better than another or this is an upgrade from a steel crossbar. It's what was used on the Carrera suspension and makes sense to sell as a (mostly) complete kit.