The only problem they had were the intakes and exhaust and the stock tune had to be rewrote. All because svt boasted 325rwhp and most models were 10-20hp short of that. No need to have replaced the motors. I love my 99. Mine was a beast when I bought it stock.
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1999 Cobra black with medium parchment interiorJLT CAI, RWR motorsports tune, Pacesetter Longtubes, o/r xpipe w/cutouts, Flowmaster Super 44s, built t56, Kevlar clutch, Nitto NT05R, Ford Racing 4.10 gears, MMR 900 rotating assembly, vortech v3 si, twin aeromotive 340s, aeroquip lines, 80lbs injectors