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Are you thinking of the Pro-Kit, or the Sportline? The Pro-Kit has a rating almost the same as the ZSP springs (according to the Spring Rates sticky thread), but Pro-Kit springs are highly progressive, which means the rate changes with position and defeats my impressive math-fu.*
The sportline I don't know the rate (they're also highly progressive) but if I had to guess, I think they will be significantly stiffer (higher spring rate) and therefore will be more than 0.5 inch higher on your 328i than they would on a 335i. But it will be, like 0.6 or 0.7 inch higher, not more than that.
*I made a slight error including unsprung weight in the calc, but it makes almost no difference.
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2007 328i ZSP. M3 suspension: custom valved Bilstein shocks, Hyperco race springs, M3 lower control arms front and rear, M3 sway bars, and M3 subframe bushings. E46 front guide supports. Euro tail lights. |