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I'm pretty sure someone measured that at just about 2.25," which means that they are not any larger than the stock exhaust components.  Additionally, I believe Greg showed moderate gains on a dyno by switching from his 2.5" to the 3" downpipes... so if there's a gain over that half inch, I'm sure there's a larger gain over three-quarters of an inch. 
  I love elitists who aren't really elite in any way... they amuse me greatly.  | 
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