Thanks for the help, car is non turbo, recently installed new exhaust 2" from cat back, which is why it is now more of an issue cause it's louder, it is worse when cold (i think) and i'll check the y pipes and gaskets for leaks but, what is the best way to check for these leaks??
Yes the air injection system is still hooked up.
It has also been suggested that a vacuum leak (somewhere, in the mass of vac lines that is a EA82) may be a contributing factor, what do you think?
james