GodStang is right again. Also, the C&L Mass Air System will improve performance 6-9 HP, but will not affect exhaust sound. It allows more air to flow through the intake, has nothing to do with exhaust tone (I've got one, I swear by it, but it did not change the exhaust sound).
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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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