1 Chamber, resonaters, or magnapack???

I have 40 series flows, 2.5 inch pipes and 3.5 tips, I want your opinions on the 1 chamber flows, magnapack systems, and resonaters. Keep in mind that I am just going to swap out the muffler part, I don't want to waste money on the pipes that I already have. Any suggestions are apreheciated, I am looking for a meaner sound than i already have!!!!