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Curious to see if there is a big difference between R230 and R200 and if there are different couplings available for the R200. I was reading a bit about it a while back and Subaru made some different center diff couplings: [ http://www.mrtrally.com.au/performance/viscous_coupling.htm ] I wrote to them and asked what kind of drop off the diffs saw as they got older, specifically if they reached a certain age or mileage and just failed or if they lost lock up in a linear fashion, but they didn't write back, sad face.

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