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Old 01-21-2012, 07:19 PM
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recon chris recon chris is offline
Motorized Bicycle Senior Member
Join Date: Apr 2011
Location: pacific grove
Posts: 87
Default Re: Getting all 3 Horse Power out of your GT-5 Sky? (tear down)

Fun facts about the old and the new dimensions on the two exhaust systems.

Header inner diameter 17.75mm
Header outer diameter 20.2mm
Final exhaust port diameter 10mm

Header inner diameter 26.2mm
Header outside diameter 29.6mm
Final exhaust port diameter N/A
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