I'll get some fly by vids up in the next day or so. The stock catback is actually pretty decent, sans the huge 35lb muffler. It's 3" from the y-pipe to muffler, then 2.5" after that. I bought an $80 Flowmaster super 44 3" inlet dual 2.5" outs from Amazon and had it welded in today for $60. I'm pretty happy with the results of my $140 catback. Truck has an xcal 3 with a tune, Airaid intake and now the slowmaster.