[Dansgreat]

Hi! I was wondering what did you guys change on your focus SPI's at or before 205k kms? I live in Quebec, and I seem to have lost some fuel economy on my car since 100k kms. Economy wise, I never changed any egr parts or any oxygen sensors, I did change spark plugs to iridium after a seafoam wash at 155k kms, I changed the coil before 100k (stock coil), and I changed the egr tube. I hear now a sound that sounds like turbo when I accelerate, and my gf tells me that my car smells when I push it when she's following me with her car. Should I change the upstream O2 sensor? I never had any cel on. Thanks!