In the 99-04 mustangs when you disconect the battery it does clear the CEL but it takes your computer like something crazy around 30 starts or something close to read your car and if it is a problem it will come back on, plus with a different midpipe it may be running to rich/lean on the left or right bank and thats as simple as adjusting it with a tuner.
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2001 Bullitt
bbk longtubes,bbk off road x, mac flow path cat back,underdrive pullies,cai,bbk tb,comp xtreme energy cam,tubular front end,4.10's, 31 spline stuff, spec stage 3, sct 4 bank chip, dyno tune by excessive motorsports, kb soon to come
Never underestimate a 2v car
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