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I would actually go for something like 2.38" ~60.5 mm... I just realize 2.25 is like almost stock size.
Is it not an option?
 

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if you're planning decent modification, go with 2.5". if you're an intake/exhaust type person just go with anything. 2.25" will feel nice down low, but lack top end. I recommend getting 2.5" piping with as straight through piping as possible
 

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I was under the impression that the stock piping was approximately 1.8". It seems that 2.25 inches would be "considerably" bigger than stock. Please correct me if I'm wrong of course.
 

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Stock for the Type S is definetly higher than 2 inches. I think 2.25 sounds about right. 1.8 might be for the base models.
 

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go 2.5 if you are going NA go 3.0 or higher if you got the boost
 
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