vtec kicking in yo
get a rag or use your bare hands, cover your muffler completely and get someone to rev the car slightly and see if you can hear any hissing noise. ( LEAK )
If not, you are fine.
Cat you may be able to tell if one side is hotter than the other, personally i wouldn't test it with any of my body parts or if your checking if its gutted, should give a tingy noise if you hit it or gas smells like rotten egg


Goodluck