What the owner will describe it as depends solely on their personal feeling, but they are all much abused terms. Just recently someone posted up what they thought was an "extreme makeover"

as far as I could see it was all bolt ons, of which none were at all "extreme".
"One swallow does not a summer make."
And a chavvy mismash of modern day bike bling does not a special make either. If someone has put some
work in rather than having an "Anodised Bike Bits 'R' Us" catalogue on wheels then it might be.
Some examples:
SV + can or full system; not even modified - it's just an exhaust.
SV + GSXR shock; not even modified - it's just a replacement shock.
SV + GSXR front end; lightly modified.
SV + turbo; modified.
SV + SSSA; modified.
SV + 850cc motor, flatslides, R1 front end, AP radials, complete RC30 bodywork, RGV swinger, magnesium wheels, Penske shock: special.
SV + 14" over "Swedish look" front end, peanut tank, apehangers, 16" rear wheel with car tyre, 21" 80 spoke front wheel, Maltese cross side mounted rear light, Bates headlight, Vikings and naked women paint; custom.
HTH