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I use 10" at 250lb, helps drop the ass end and improves ride. I would go 275 if you track as hard cornering and bumps can cause a slight rub on the inside fender on occasion. CC suggests 350lb however that jacks the car as they don't need that much spring. Remember std Jag that weighs double uses 250lb rates.
I was told that change would corrupt handling, it didn't as I think its better. With 350 the car was rock hard and with the car so light sliding was occuring, with 250 it bites in corners and straights. Of course I have better tires now to.
Sart with cheap springs in the event you try a few different rates. That is what I did as its easy to change them in and out.
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