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i have FS 4-1 race header, stock flex pipe and Borla exhaust..
and i'm going to get a flex pipe.. should i go for 2.25" or 2.5" ??
(i will be staying n/a btw)
 

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2.25"

look sometime into a 2.25" exhaust.
 

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why look into a 2.25?...why not the 2.5" flex?.. i say the 2.5" flex. if u have some decent mods
 

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Unless you're going Forced Induction, go 2.25".
 
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