Do you have sub-frame connectors? Stangs have a habit of "losening up" over time. Could be the chassis flexing under load, causing body panels or interior panels to creak as they move around a little. Subs are always a good iead for a stang, it may solve your problem.
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99 Mustang 3.8L, C&L mass-air system, GT dual exhust and rear bumper, Maximum Motorsports 4-point K frame brace, full length sub frame connectors and strut tower brace.
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