This will probably get some arguement but when you removed your cats you sped up the flow past your o2 sensors that in turn will let your air fuel ratio go up a little especially if you have a high flow air filter or cai because the o2 sensor does not get the same reading it used to get also it doesnt heat up as fast.its not unusual for gas mileage to go down a little after heavy exaust mods,but the extra horses are worth it.
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1994 GT 5.0 5-speed
BBK O/R H-pipe
flowmaster 2 chamber
densecharger(demolet motorsports)CAI
3.90 motive gears
BBK progressive rate springs
king cobra clutch
air pump and smog system removed and shorter belt
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