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Replace with the OEM or get all 4.....don't get just new aftermarket rears.

 

I would suggest you look at the Koni Sport Suspension (Yellow).
Great suspension.
Adjustable
Good ride

 

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KONI FSD's are very popular as well. I have them on both of my MINI's and really like the ride and handling they provide.

 

For your planned use, I suggest Koni FSD.

 

Will the KONI's reduce the ride height at all?

 

They will, but only by about 1/4 to 1/3 inch.

 

The Koni FSD should not reduce your ride height at all, as they're typically designed as a stock replacement strut with better valving technology for better performance and comfort.

Koni Yellows (a standard in entry-level performance) have a slightly shorter strut body and piston, designed to be used with lowering springs. They are also valved stiffer for compression and rebound. This gives better handling and a willingness to be paired with stiffer springs that are also designed to lower the car. These should lower the car slightly when paired with stock springs, but not a lot. The real benefit is seen when paired with performance springs (or something like ground-control sleeves).

 

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I know the FSD's shouldn't lower the car at all, but they did on both of my installs. Not enough to really change the geometry, though. There's a pretty long thread somewhere on this site about this exact question. Consensus was the amount of lowering I experienced.