I just removed my Fujitsubo exhaust with its gasket and put the stock exhaust back on.

I cant remember if the stock exhaust had a gasket or not? Does it? I put it back on without a gasket.

I have not had any CEL come on, but I dont want any leaks to start developing.

 

The stock exhaust uses a steel o-ring that sits in a groove. The o-ring stays in it's groove after you unbolt the exhaust.

 

i don't recall my stock exhaust system having a gasket anywhere in the system, except the o-ring that connects the header to the cat.

it sounds like you'll be ok.

 

The steel o-ring sits after the Cat and gets flattend when you fit the exhaust. I have recently fitted a T1R test pipe and that uses a gasket rather than the o-ring.