WHoa... I've been recently experiencing that SAME thing. I was thinking maybe with the cold weather coming, maybe teh exhaust smell just became more noticeable- or that my true duals and lack of cats/precats would be acting up and causing the smell. I did have the plugs pulled a little while ago, maybe I fudged something up.

2006 Pontiac G6 3900SFI GTP Coupe CAI, Stainless Cat Back, Vector Tune, Strut Brace, Eibach Pro Kit, Custom Made Projector Headlights, 4300K, 20% Tint Former Owner- 2000 "Stryped" CSVT CEG Dragon Run- Oct 13-15