[frank13]

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

 

[blown473]

exhaust size

With your cubic inch/build you will run better with the 3", any bigger is overkill. Too big a pipe lets the exhaust cool with slows velosity, your low end torque will be greater with the smaller pipe.

 

[Taxman]

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.

 

[frank13]

i have the option to run either 3 or 3.5 inch pypes prorace mufflers so i am trying to figure out what pipe to run

 

[ITSA 91]

Most of the time you will be able to fit fulllength 3in tailpipes.I have not been able to get 3.5in to clear everything going over the axel.

 

[CarsByCarl]

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.

 

[crittersf1]

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.

X2