Ok so I have a 06 i4 and have the Megan header ark dts cat back injen cai and the other mods shouldn't matter but I also have a act stage 3 clutch fizda alm flywheel twm shot shift kit 10000k hids 4 prong iridium plugs and 8mm plug wires I dont have the o2 sensor spacer on either one and my gas mileage went to **** car ideals high as hell at start up and u can smell fuel when u drive the car I do have the o2 sensor spacers should I put both on or just the rear one? Could this fix the problem? I do know that tibbys run rich and I have searched a lot but still no definitive answers. Anyone have any ideas?
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