borla or magnaflow mufflers blown 340 3" or 3½" ?

no way im running flowmaster, i tried that some years back on basicly the same engine but without the blower and i dont mind loud cars but that was ridiculus,thing ran faster without them aswell,quite a big diference when i compared to the straight thru mufflers i replaced them with..

hm didnt know magnaflow had that kind of isues, i know of some other smaller isues but thats just bad:(