The PSS9 kits for the non-M cars all run the same spring rates. 318-328. I don't know why, but that's the way they do it. Probably because the struts themselves are adjustable. The M3 struts are shorter apparently, and to use those I'd have to change axle parts and hub asseblies, the part that the calipers mount to, the stub axle and something else I think.
The spring rates used for the other 6cyl engines should work fine with the S50B30. |