I have H&R Sport springs and Koni Yellow shocks and they gave my e90 a nice drop, but nothing too extreme. Looking back, I would have went with the coil overs for the adjustment aspect. Keep that in mind when you purchase, as you might want that option in the future.
BMW '11 E90 ZCP M3 Jet Black/ Dinan Intake and Dinan Exhaust/ Lux V4/ 25% Tint.
*M3 E90 stock stock exhaust, and assortment of exterior OEM parts for sale! If interested, please send me a PM.*