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I don’t have any experience with the gundo hack, but I can’t say enough good things about my fister modified cans...I did also put a sharkwerks crossover pipe...it makes a glorious noise with absolutely no drone...you can have a whisper conversation on the highway...but when you put your foot in it...wow! I rarely listen to the radio when ‘exercising’ my 10 C4S...and the guys at fister are great to work with...lemme know if you have any questions and good luck
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