You can use both a girdle and windage tray. I'm running the DSS Main Support System and their Windage Pro Tray - both made of 6061 T6 aluminum, not steel. DSS's theory on using aluminum vs. steel is that the aluminum absorbs engine harmonics much better than steel and it's plenty strong.
Good luck, and welcome to Mustang Works!
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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