Go with the Bilsteins. I see you have a 914, so this means you have been driving a mid-engine car for awhile  I run the Bilsteins with 450 and 500 rate springs with GT3 bar and Tarett 4 way rear bar on a lot of Boxster's. This REALLY balances the car out nicely. It is the same setup we ended up with on the BoxsterSpec cars.
Saying that.. I also have Boxster's with 700 and 800 rate springs under them, but not on PSS9's.
B
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