Headers don't have pre-cats and therefore higher emissions (if you need to worry about that). The mystery mod is like the poor man's headers.
'98 SVT
KKM / TH fix / Mobil 1 / Synth tranny cocktail / JVC LX-30 HU / 10" JL sub / Alpine V12 amp / Panther 199 wheels / Kuhmo Ecsta 215/45/17 / Bosch +4 / Ford Motorsport wires
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