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I have Dyno Max Ultra Flow's on my Nova and for a race car they are quite. I did not lose anything e.t. wise from open headers to the 3" inlet/outlet mufflers. If the Summit Ultra Flow's are Dyno Max without the name, I say DO IT!
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1973 Chevy Nova - best e.t.-10.04 - currently disassembled
1989 Pontiac Trans Am GTA
2016 Dodge Durango R/T
2015 Ram 3500 Dually Cummins
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