I was just wondering which donut do you use to put on your collector so it'll seal it up for no leaks. It's that gasket around the collector.

 

One from a S2000 will fit.

 

is that the only one that fit?...have you tried it?

 

kteller sells 2.5" gaskets i think, i know they sell flanges for sure, but just PM or email them to double check an alternative would be to pick up the liquid gasket at pepboys, etc, but its a little messier if you wanted to remove it later