ok, i have a 2.5" downpipe with a 3.00" collector. since i pulled the downpipe off, i decided to replace the gasket. the gasket that was put on there originally is a pretty thick gasket, about a quarter of an inch

so, i bought a header collector gasket made by mr gasket at kragen that is originally for a chevy. so, the situation is this, the pack comes with two gaskets. both are pretty thin but when put together are equivalent to the size of the original gasket. since there are two gaskets and if i put them together to equal that size, would there be a change of exhaust leakage since they are put together? or should i just use one gasket instead to avoid exhaust gas leakage?