need help pronto!!!

[Sonik]

ok..i have interior fumes.....what can be causing it?..
i got a n1 cat.....but it doesnt stop the fumes?.....what can it be causing it?.....when i drive like in the freeway..or street.....and i stop....the fumes fill up the interior...it f**ken stinks!!!....can it be the head gasket?......idk?...or a cabin air filter?....
please help out........;(

 

[EJ6_DMS]

have u any holes in your header?
check for creamy stuff in oil filler cap, no cream = headgasket fine

 

[XpL0d3r]

exhaust leak somewhere?