soup up

RD9月号のDo-it-Yourselfガイドにあった記事からです。
The rule for an IKEA hack is simple: at least one IKEA item must be modified or repurposed in the finished product.
This includes personalising and repurposing original IKEA products towards customised end products or furnishings adapted to suit the user's needs - often souped up versions displaying dashes of inspirational creativity and unexpected twists.
"souped up" は以前に取り上げた "juice up" (Ref. blog.alc.co.jp/blog/3302827/archive/2009/3/6 ) を連想させます。　辞書を見ます。
・Merriam-Webster's Online Dictionary: to increase the power or efficiency of: soup up an engine: Origin of SOUP UP: soup (drug injected into a racehorse to improve its performance)
・McGraw-Hill Dictionary of American Idioms and Phrasal Verbs: soup something up: to increase the power of something. He souped his car up so it will do nearly 120 miles per hour. If only I could soup up this computer to run just a little faster.
"juice up" と同じような意味でした。　競馬の事は疎いのですが、 "soup up" は今は競馬でも非合法と思いますが。