4 cubic inches isn't really much of a big deal. With the proper cams, compression, heads, exhaust, and tuning, you'll see somewhere around 120/120 and you'll have several thousand dollars invested in your engine. You'll have a dyno sheet you can be proud of, and you'll have a Road Glide that's somewhat faster than stock Road Glides. But it's still a 900 pound bike with lousy aerodynamics, and it's still comparatively slow when comparing to other motorcycles.
You can do a good Stage 1 for about a grand; less if you troll the Classifieds. The performance increase from that to a built-out 107 will be noticeable, but just ain't worth it to me.
'05 Night Train, '16 Road Glide Ultra
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