I paid I believe 39.00 for my conversion harness brand new from an advertiser at MM&FF magazine it also came with very detailed instuctions, no its not hard just time consuming. Remember to solder the connections not crimp as it usually runs into problems later at the computer. You just have to access the computer by the pass kick panel swap in the mass computer, swap a couple of pins and add the harness.
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Only 1/4 mile track I know is Gandy Bridge