Abbott ERA Installation Instructions FOUND....
 

After some searching...

Abbot ERA install instructions can be found at: http://www.lx.net/jlynch/abbott.html

Thanks to Joe Lynch and Corral.net for the tip off...

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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...