Both are Garrett units and both are excellent kits! We've installed several of both this season alone and the Z1 Units make slightly more power for a better advertised price. Z1's GT675's and JWT Sport 700's are comparable as well (Garretts) - Z1's are better priced! No issues with quality or warranty claims on either thus far! We are distributors for both in Canada! Regards, Vuk@AMS [ www.amszstore.com ]

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