Jamie, Thanks for the price quote on the ThunderMax. I have a question about the bungs. You mentioned I need to weld in 18 mm bungs. Do I plug the old holes and drill new ones in each pipe? Looks too crowded to stack bigger bungs on a 2010 FLTRX in the stock location.
I'm not Jamie, but I'm about to add a ThunderMax to my '07 FLTR. It's equipped with the same stock 2 into 1 2010 Harley exhaust you have. You'll need to plug the 12 mm bungs you have now, & add 18 mm bungs 4 or 5 inches from the exhaust ports in the head. Look at the video on Zippers web site.