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They'll still overload the rear half of the spring pack and negatively change the working geometry of the spring.

Why are people so opposed to having their springs re-arched? Or just buying the right springs? Sure, it's more expensive, I get it. But if you'll spend thousands of dollars on engine go-fast goodies to "do it right", then why the heck does everyone get bent out of shape spending a few hundred bucks on the right springs?

Cheaping out on suspension parts is the last thing you want to do, especially if you're already making more power up front.