Hi Folks, I have pepped up the engine with a few upgrades but done nothing to the suspension on my 2001 ///M5. Stock is pretty good but the body sure rolls on this heavy baby in spirited cornering. I'm considering the Bilstein adjustable coilovers @ $2500 or the Dinan S1 (which is springs, shocks and struts) for $1500. I seldom track the car but love the twisties in the back country. Any recommendations?