you will, the spring rate is different on verts because of the extra weight of the vert motor.
I never had any issues with my vert either. I had coupe rear shocks and Steeda coupe springs in it and it was perfect. The coupe rate shocks actually helped eliminate the wheel hop issues I had with the vert. They were stiffer than the vert shocks.
The 2010 Coupe is 3924 lbs, the vert is 4000 lbs. You really think the 76 lbs difference between the two is going to make that much of a difference in spring rate and handling characteristics? If you do, then you should also considder the difference between driver weights, passengers and anything in the trunk and swap spring rates to compensate whenver that bias is changed.... [insert sarcasim here]
The different rates between Coupe and Vert springs have more to do with body and chassis rigidity and shock stiffness than with weight bias. You won't have any issues running Coupe springs in a vert other than MAYBE a little bit of a harsher ride do to the very minimal increase in compressed spring rate. Like I said above, the vert shocks are a little softer than the coupe shocks, so the vert springs are also a little softer to compensate. It has very little to do with weight bias, but I'll let the experts take it from here.
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