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They advertise 13 HP increase with tuning. Most tuned busas with PC2 and HMFs are running around 170.Hey Nitrosjunkie, The high mount HMFs look great. I am considering the low mounts to retain the stock look. The twenty dollor question: Did the exsaust mod give you much more power. Is it worth $1000?
Mine improved 7 HP just bolting them on, so yes they make good power.
