I have messed with all types of suspensions from old musle cars , bike and mini trucks and now BMW's.
Yes there is a noticeable stiffness to the chassis. As soon as I backed out of the driveway at an angle ( Big drop onto the road ) I could tell the chassis didn't flex as much.
When going into a turn the car does not tend to oversteer. Before there was a slight hesitation then it would dig in and turn. Now it's much more reactive to steering inputs.
I have an 99 328is with the sport package.
I plan on putting all new drilled brembo brakes and stainless lines soon.
I'm also updating the whole suspension to Bilstein Pss9 coilovers, with Sway Barvarian sway bars front and rear. It should be ready for a track day or two real soon.( I will probably put the rear subframe plates in too)
I just ordered an M3 Front bumber/spoiler with splitter from Turner Motorsports today. It already came with a stock M3 rear spoiler.
98 328is Sport Package M3-Spoiler and Front End,
Turner Motorsports 4 Wheel drilled Rotors.
Axxis Brake Pads, Teflon/Stainless Brake Hoses.
UUC Sachs Stage 4 Suspension.
Sway Bavarian Sway Bars.
H&H MotorSports Front and Rear Strut braces.
Conforti CAI and Shark Injector.
UUC System U DTM Exhaust
UUC Short shifter , Tranny Mounts and Clutch Stop.
F1Danza Lightweight Flywheel with M-3 Heavy duty clutch.
Factory BMW M3 Front Bumper with Splitter.
More to follow...MUCH MORE !