well i could tell you what the smell is! lol its you catalytic converters... theyve gone bad. the smell is all the carbon build up burnin. not pretty eh? my suggestion... remove all 3 cats, relocate your O2 sensors and run "true duals" back to some flowmaster super 40's or 44's
of course you could do what i did and replace the cats but just ad a down pipe after the resonator... hehehe
