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Iv been on ISC 18k/16k springs for over 6 months now and 5 track days. They have been great for me no complaints. I would say they compare to tien,bc, hks and all other basic or entry Coilovers. They won’t stand up to the $2,000+ coilovers though but coming from an 08 suspension these have been everything I’m looking for in and off track