I am sure you got plenty of gains but I would not compare baseline dynos vs modded dynos at different shops, too much potential variance. Head back to Z1 on March 19th for a $30 dyno and see if you put down 300+ there. it would be a more realistic dyno gains estimate, but again even that depends on temperatures, humidity, etc.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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