The Mac kit uses the stock mass air sensor. You have to remove it from the air filter housing. It then bolts to the pipes Mac supplies. If you look at pictures of the Mac kit, you will see an aluminum tube with a black box on the top in between the 2 chrome tubes Mac supplies. That is the stock MAS.
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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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