I am running NISMO cat backs and berk hfcs. I smile every day when I drive my Z with this setup. Nice low rumble, no hiss, no gurgles, no drone, and plenty of roar when you get on it.
I am not sure you will gain much with a h-pipe delete...
My .02
Sterling
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'14 MB Tour Sprt Persim. Nav/NISMO Exhaust Berk HFC's/HPS MAFs & K&N/H&R 20 25mm Spacers/Clear Bra & Tints/GT-R lens/LatheWerkes Knob
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