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I just started having this issue also. I hear rattling under load at almost all RPM ranges. It's a harmonic noise. Goes on and off depending on the exhaust vibration. I've been reading around and it seems the be heat shield rattling.
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Vortech SC on 9psi Pulley, Invidia Catless Front Pipe, Invidia N1 Catback Exhaust 
242whp/197ft-lb on Mustang Dyno (91 octane water)
284whp/223ft-lb on Mustang Dyno (E85)
Delicious Tuning |