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2 1/4 inch"? Why?
 
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Because it's a tiny little 2.0 engine. Any increase you would get from 2.5 or 3" pipe would not be noticed until a turbo upgrade. Which means 2.25" is adequate for 99% of ST owners. And it weighs less. And it's cheaper for Flowmaster. :)
Stock size is mostly 2.5 inches I believe with a smallish section of 2.1 or 2.2 " OD. Any turbo application vehicle, even a 2.0 with our punt k03 will benefit from a larger exhaust/better flow....to a point or course.

But what ever..more options for people is good.
 

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Not saying that at all. Didn't mean to offend u or knock their product. I actually didn't see there was only a small resonator/no muffler. Just seems odd they went with 2.25 when stock is bigger in most sections and I could just remove the muffler from the stock system and its basically the same thing.

To each is own.
 
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