[DrPancakes]

Found a nicely priced KW V3 on the forums for a 330i RWD. The part numbers seem to be the same as the 340i AWD so I'm probably going to pull the trigger on these.

With that said, the spring rates are different and the 330i doesn't have helper springs for the rear. I'm assuming the helper springs aren't necessary if I buy some linear Swift springs in the back?

Does anyone know what the spring perch size is on the KW V3s? On the E46 forums, they say its 61 mm and may need some machining.

https://forum.e46fanatics.com/showthread.php?t=778204
https://www.hpashop.com/Bilstein-PSS...?categoryId=-1

KW site only lists one spring perch on their spare part shop:
https://www.kwsuspensions.com/produc...-65243226.html

Any suggestions for spring weight or what the approximate linear equivalent is for the KW V3 springs? I was thinking a little less than 336 or 392 lbs in the front and 728 or 784 lbs in the rear.