YES MY BIKE IS PORTED BUT I HAVE NO IDEA WHAT TYPE OF PORT OR DOME SIZE. THE COMPRESSION IS AT 182 AND HAD A TRINITY 2 IN 1 BUT I TOOK IT OFF AND PUT STOCK CARBS ON. THE BIKE HAS MAJOR BOTTOM END SO I THINK IT IS A MX PORT DEF NOT A DRAG PORT. THE KID I BOUGHT IT FROM SAID HE THINKS DUNCAIN DID THE PORT .HE WAS UNSURE DUE TO NOT ASKING WHAT WAS DONE WHEN HE GOT IT. I HAVE A VITOS COOL HEAD ALSO. SO I WAS WONDERING IF I USE THE CAGES I HAVE WITH CARBON FIBER REEDS OR GO WITH THE V3'S. I DO ALOT OF TRAILS AND DUNES TWICE A YEAR HOPFULLY BUT THE FOUR STROKE ALSO COMES OUT FOR THE DUNES.