This is single exhaust.
I just cut out the original muffler.
Stock set up -(after cats) 2, 2.5" pipes into a 3" pipe into Hooker - 3" pipe out to OEM tail pipe with resonator intact.
My resonator can (see green arrow) is behind the axle and I have a massive mirror polished, double wall, rolled edge chrome tip.
I left the res can on to see how it sounded with Hooker - I love it - so it stays.
NO drone in the cab - I couldn't have asked for a more pleasing roar from a single exhaust set up.