They should sound similar, but I haven't met any other 3rd Gen owners who have modded their cars yet. But I don't see them sounding radically different though.
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Dyno numbers: 177hp/163tq
Mods: Steeda Intake, STS Kit, Rear sway bar, Lowering springs, Steeda RMM, F2 Header, Magnaflow catback, SCT Tune
Moderator: Third Generation Ford Focus, DURATEC Ti-VCT GDI Performance Chat & Florida regional section