I replaced my stock struts and shocks with Bilstein HD and then put in the IPD swaybar a few weeks later. Bilsteins greatly improved 'directional control' on bumby road, firmed up the ride (had the sport suspension), but not unpleasantly so. However, bumpy roads are very obvious.
Then the swaybars--significant improvement in cornering. I commute up and down from 7200' to 4200' on an interstate through a canyon--there are some curves I felt a little uncomfortable taking at 70mph due to body roll. Totally gone now. Car stays flat and same curves actually feel like they have been straightened out.
IPD will make you a package deal for the swaybars and the Bilsteins. They totally changed the handling of my 850, all for the better--it's like I bought a new car at 105k miles!
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96 850T, Bilstein HD, IPD swaybars
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