I checked out the spring rate table off of e30tech.com and it gave two rates for stock E30 M3 springs: 114F/314R and 140F/250R. The first number came from the 6/87 issue of "Motor" (Magazine?), the second from who-knows-where. Those numbers don't mean too much unless we know if the drop is the same for both sets of numbers. Does anyone have any more information about rates or drops for stock M3 springs? BTW, the table says that the rates for H&R OE Sport and Sport springs are the same (180F/380R) but the Sport springs have a bigger drop. I suppose that the same rate with a shorter spring is what gives a firmer ride and better handling.