Hey I have have true dual on my 78 and It isnt an issue,, here in Jersey though.They just stick a sniffer in EACH pipe.I had also put true duals on my 87 suburban that I had at one point.Like the broncos coming off the Y pipe going into one cat I had to run a cat on each pipe and it worked out pretty good.And as for the glass packs they do sound good,I have summit fully welded mufflers on my bronco now,but once I replace the headers with the fender well headers Im going to put cherry bombs back on it.
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