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Stock on the Goat is 2.25".
 

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WAM! (acronym for wait a minute) I thought the 05s had a larger diameter exhaust than an 04. Better measure it.
 

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I measured the inside diameter of the exhaust tips on the SAP pipes. They read 2.5" each for 4 pipes. The same measurement on stock is more. I think they are 3" or 3.5" They are bigger than those on the SAP. The ones on the SAP give ya a total of 10" "sound efects" for everyone's listening pleasure.
 
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