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Also, your a/f ratio is altered during the running of the vehicle, and many times per second. With inputs such as CKPS, CPS, TPS, MAP, MAF, O2, and KS coming in at anywhere as high as 360,000 signals per minute (60tooth at 6000rpm), the computer is altering critical injection and ignition events constantly. If you change the VE, or other parameters of the engine that would effect O2 readings (rich/lean), the computer changes the long term and short term fuel trims to adjust to these conditions. Changing your exhaust doesn't change this, it just changes the efficiency at which it operates at given rpms (as some are better high than low).
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