Mines not really poppy, but I havent heard any other six with any other kind of Flows either. There is a slight pop on the high end when you floor it in idle, but thats it.. just one or two pops and its never under load.
I have a "true dual" set up with 2 12" resonators. It WAS very poppy before I put the resonators in, but they took care of the problem flat out. I plan on adding an H-pipe later on (I cant afford to go back for an Xpipe or anything fancy) and pull the cats / resonators later after I get a CAI and more air flow going back.
In my opinion the delta series was never an option. I wanted that true oldfashioned sound Flowmaster
is known for.. and I think I got it. Ill get you a good video later tonight or tomorrow. Ive posted one here in that huge exhaust thread, but its mellowed out alot since then and I think that one really gives a bad impression.