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because the GT spec is huge!...3.74inch piping. not everyone with a 240 has a turbo or engine swap...you dont want that huge exhaust with an NA car. it would be very very loud. with a turbo car, i would choose the gtspec...with an NA car, i'd get n1(actually i would never get n1, but those were the only 2 options...in reality, i'd get apexi n1 duals for an NA 240).
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