Unless they're STi "pinks" springs they're not worth that much to be honest.

Better to keep them for if and when you sell the car and want to take the good bits off and return it to stock.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO