Sounds familiar. I recall reading something here about it dripping on a weld. Try to do a google search, youl find a link to mustang evo im sure
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2002 GT 5sp. 16x,xxx miles
Steeda Exhaust, C&L plenum, BBK Throttle Body, Steeda Underdrive, Steeda short throw, unknown stage clutch. Rear main leak. Compressor seal leak. Steeda lower control arms. good tires.