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[harleydog]

what causes the exhaust on the right side to be hot  and  the  left side warm 07 serk

[CVOSE]

The valve in the exhaust system.

With full throttle both pipes are open.

[harleydog]

i think on factory 07 models the right act like a 2 vinto1 system a takes on most of the exhaust  but at the rear head y into the  left exhaust

[happyman]

what causes the exhaust on the right side to be hot  and  the  left side warm 07 serk
[/quote

my 07 had a cat in the right muffler.. that may explain it..  i may  take the cat  out, pull the baffles and install some fulsac 2",  put them on the 2010 LTD when i swap cams and do a decent aircleaner, should be good to go for what it is. 
anyway  look for a cat in the right muffler

[Lzyboy]

that is a great question and thank you for the input. i was wondering the same thing. thinking about changing my pipes from TDRH to Vanes.They are starting to become very particular in their refunds. The famous discoloration has occured with the rt side cap. Along with discoloration on the twist from going left. Sent RH an email explaining the problem and they want everything proven before they determine the cause.