An "import tuner" is a term used to describe a person who modifies or upgrades imported cars, specifically those from Asian manufacturers, in order to enhance their performance and appearance. Full definition
Evo vs STI vs GT - R Import Tuner Magazine takes the big three Japanese performance all wheel drive cars, and pits them head to head in... (2009gtr.com)
In Japan, however, turbocharged versions of the 240SX (known as the Silvia in its home market) were dominant in drifting and motorsports, making transplants a popular choice for import tuners. (autobytel.com)
As a result, the CRX and especially the Si became adored and prized by the burgeoning import tuner crowd. (automobilemag.com)