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A common debate irs vs. sra but IRS feels/handles better. No matter if it's a weaker design or not. The key is to them lasting is knowing how to adapt your driving to fit the IRS.
i drive both and i dont think their is much difference between the 2. my gt has bbk progressive springs with upr control arms and 315, rides the same as my stock irs cobra, with only the front irs bushing swapped out.