24-07-2012, 06:23 PM
It's not stupid at all 
There's some more info on the first page (post 10). But anyway, the rear beam mounts on 306s are rubber, which means they flex and allows for passive rear steering, however they do wear and you'll find that when they're worn your car will feel a bit tail happy under heavy braking and can oversteer fairly unpredictably. Replacing the mounts helps with this, but the solid ones remove the passive rear steering and allow more controllable lift off oversteer, as well as making it easier to brake from high speeds in a straight line.
There's some more info on the first page (post 10). But anyway, the rear beam mounts on 306s are rubber, which means they flex and allows for passive rear steering, however they do wear and you'll find that when they're worn your car will feel a bit tail happy under heavy braking and can oversteer fairly unpredictably. Replacing the mounts helps with this, but the solid ones remove the passive rear steering and allow more controllable lift off oversteer, as well as making it easier to brake from high speeds in a straight line.