Last year I added most of the engine mods in my sig. This year I have noticed a strong ehxaust smell when the windows are down. I am wondering if I could be getting this smell because the fuel pressure is to high? I have not noticed any leaking sounds from the exhaust.
I would say if you can't find any leaking... fuel injectors, exhaust it'self etc. that it is most likely your fuel pressure. Possibly need to change your fuel filter? Anyone else??
dont know if this helps but when i pulled off my smog pump i dident cap off one of my vacume lines and the smell of gas was strong and my gas milage went down capped it all was good again