I'm with Frank on this. Bags have 2 purposes: big rigs with varying loads and show vehicles. Outside that they aren't needed as steel springs do a better job more consistently with less chance of failure. Be sure to consider spring wire diameter, as that makes a bigger difference to strength than the coil diameter and length. the latter two are more of a control for bounce and side stresses. Notice some aftermarket coilover setups use 2" or 3" springs with a higher rating vs. the 4-6" stockers? Thicker wire diameter. If the Murano springs are nearly the same length and diameter, check the number of coils and wire diameter. Google some spring sites to calculate load/strength/etc with stock springs and the Murano springs. See what your new height and load rating will be. Don't guess! Try it! (Bill Nye anyone?)
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