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Yeah, your time sounds about right for a NPI 98 mustang. And your mods really don't do much to boost 1/4 mile times except maybe the midpipe and gears.
and to Bojangle, the pre-05 stangs don't need a tune for the CAI, but he would for the gears.
oh my bad, i had 2 mustangs pre-05...99 v6 and 01 gt but never modded them so wasnt positive about the cai, but definately the gears.