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ok, so i am trying to decide between going 3 or 3.5 inch exhaust pipe,

the header is a 3.5inch collector,

do i want to reduce that to 3 inch or just run 3.5 all the way?


its a mild 466 build ina 3000lb 02 mustang with a manual trans
 

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I'm running a hooker header with 3.5" collector in a mild 466. I thought maybe some back pressure would be good, so I made back to back passes with open headers and then through a 3" reducer to a flowtech glass pack type muffler. Turns out the car ran .15 quicker with open headers.
 

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Run 3.5" from the collectors to the mufflers (or to the x-pipe / crossover) and 3" from there back. The further the exhaust gets from the collector, the smaller the pipe can get without hurting power.
 
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