mmorse

my 08 coupe has recently started to smell like spent fuel in the garage and while driving. it's not real bad but still annoying. does not smell like rotten eggs or raw fuel. more of an exhaust smell.car is stock except for vararam and it has an NPP that is always open. I've run the car that way for 7 years without any smell until recently. I don't see any obvious leaks and the car runs fine. any ideas? want to avoid the dealer if possible. they don't know squat about corvettes.