The Streetfighters scene started in England late 80's.  This newest motorcycle trend, the Streetfighter (or Fighter for short), are motorcycles that have undergone drastically aesthetic changes, performance upgrades and engines heavily modified. 
American Streetfighters
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major performance improvements and it was easy to visualize it  in my mind.   My Fighter projects started with a Vmax back in 1997 a 98' Model "J' Wrath", with a chain conversion and 1500cc engine, later in 04'  started transforming the Hayabusas into Street-Racers & Fighters.
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Streetfighters parts & Accessories
Streetfighters parts & Accessories
Fighter are UNIQUE, They are "one of a kind" and can never be copied or duplicated!
By mid 90's the trend migrated to Germany and the rest of Europe.  In Europe, the Fighters scene became huge for the past decades, but mostly in Germany and England is where you can find these Streetfighters or Fighter at their maximum expression mainly in the street, shows and tracks. Also in most European publications, meetings, news etc.. you can read or have contact with this subculture. 
In the United States the trend is just starting and will not take long before we see these Fighters in our streets and shows.
I've been customizing my rides since I can remember, from simple aesthetics changes to