Slow build of my 06 Silverado

I ordered the ones with the high flow cats, hoping to eliminate a lot of the rasp that goes with catless pipes. I've been listening to youtube vids all day trying to figure out what to go with but I can't tell what would sound good
 
a really long magnaflow would be your best bet

and instead of cats, i would but a dynomax bullet in front to act like a resinator.
 
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