An off-road H pipe will definitely smell 'richer' than a Mustang with cats intact.
I noticed it immediately when I put on my H pipe.
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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