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               Originally Posted by 
              mxmotard  
              Hey guys, Im new around here so first of all ill say gday!Ive got a 07 XT660X. The header pipes glow bright red after warm up. only mods are exhaust but header is standard. any idea what may be the cause. i have not noticed this before.
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         just did a quick search and it appears normal. Was thinking it may be running lean??