Go with the 1- 5/8 headers, I think the 1-3/4 might be too big for your combo. If you had a s/c then the 1-3/4 would work.
No idea about the mufflers.
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1989 Mustang LX Notch
5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials
Best 1/4: 13.33@101.53MPH
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