The only thing you lose is the maintenance interval stuff, clock, window auto up/down, and maybe the trip mileage and radio presets. A loss of power even for a few seconds will reset that stuff. But engine tunes and important stuff is all stored even with no power for months if not years.
You could buy something or spend an hour rig up some wires to keep power while you do the replacement but it's completely unnecessary because a pencil and a piece of paper with and about 10min could record and reprogram all that stuff.
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GTR TT 493Whp/431lbft, Ecutek, Southbend 6puck,Quaife, RPM RollBar 4Point, R888R, JRZ RSPro F(10R/10C) R(10R/6C) 1000f500r inlbs+150inlbs Tender, SPL everywhere. Full Specs
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