I remember reading a magazine that swapped Flowmaster's for Dynomax Ultraflows on a bone stock 5.0 stang and gained an extra 20 horses. I'm not sure if it would be less with HCI etc.
89 2-tone Black Over Silver Notch
S-Trim, AFR 165's FTI Custom Cam, Gt-40 Upper/Lower 3.55 Gears, a bunch of other stuff...
435rwhp/448 rwtq - 12.20 @ 121mph w/a 2.0 60 ft on Nitto DR's
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2006 MazdaSpeed 6 - Daily Driver