'06 Sportster XLR.
#thunderheader
#HD1🧡🖤 😎

...and that stock air breather has got to go!
#ANbigsucker #ArlenNess
#Thunderheader
#HD1🧡🖤 😎

Not a legitimate motorcycle manufacturer if you don't have a proprietary engine?
Discuss...
#evo #thunderheader
#HD1🧡🖤 😎

I found the box my Arlen Ness Big Sucker came in.
21% increase in power?
Not without a set of cams to go with my Thunderheader...
#catchmeifyoucan
#hotrodharley
#WrinkledInkMC
#HD1🧡🖤 😎

21% increase you'd have to add more aggressive cams, intake manifold and a big-ass S&S or Mikuni carb to the Big Sucker/ Thunderheader combo I'm running.
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