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Ok, new to this, i run a 97 SPI 5spd escort as a 4cyl race car, i had a new 2 1/4" exhaust made for it from the manifold to the rear tire, and i forgot to tell him to put the bung in for the 02. Ive been running it for 3 weeks now but each time its been getting slower and slower in lap times with the same setup on. Does not having an O2 cause problems, i would imagine it does but i'm not sure about anything. Let me know thanks.