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I built my own S&S 128 Big Bore Stage IV upgrade for my 2020 Lowrider S. I took my time, spending an average of two to three hours per day over a period of four days, then three days for heat cycling and finally two days for dyno tuning. The overall experience was rewarding. Now, just need a little more snow to melt!
All of my parts were sourced from Fuel Motto in Appleton Wisconsin through my local dealer House of Harley-Davidson in Anchorage Alaska 
Thanks for watching 😎