yup.. modify shocks only. the laden weight for the spring is more than sufficient so i reckon no point to change it unless i want a lower ride.. what i am aiming for is a the spring rate to match the dampening that i can get.
The MPerformance suspension ie 4absorbers n red springs plus anti roll bars will solve the bounciness of the standard F30. It corners flat n the absorption of the road bumps are excellent. Mine u I have 19in rims on with Michelin PSS rubbers. The car doesn't bottom out anymore