New header on the way, want to replace exhaust gaskets. What type has worked best for others, stock cone or SE flats? Ive seen both used in searches, how have they held up?

 

I've always used the SE flat ones. Never had a problem.

 

Do you double up on each or run single?

 

Just one single per head port. Push them straight in with a piece of PVC pipe of the same diameter or some peeps like to keep them in the freezer overnight before installation.

 

Install complete and no leaks! Sounds verry good and agressive, deep bass with the DNA Megaphones. Took my first ride, all of 45 degrees...noticed when parked back home, lots of metal pings and snaps as cooled off. I will presume things settling in with heating and cooling, took me by surprise. Will hit all clamps and nuts after couple heating cycles, hope that is temporary! Never installed a new header on car or bike.