"Anyone know whats the difference between Honda's B18C and Mitsubishi's GSR? I heard GSR is also B18C ??? Please advice...Thanks!"
1. Mitsubishi's GSR badge's is different from Honda / Acura based GSR badge's. Honda / Acura have GSR line-ups, for example: INTEGRA GSR which some tuners capable of producing exceeding 450ps ++. INTEGRA GSR's in West side are famous by fitting in Turbo kits to increased the power.
Click here to see INTEGRA GSR image : http://www.hazenet.com/integra/gfx/pics/photo/general/low.jpg
2. Mitsubishi's GSR lineup models are Lancer "GSR", Lancer Evolution "GSR" & also some race version called "RS". Lancer GSR are exampled as : LANCER GSR 1800 in the 1980's season and in 1990's Rally successor like EVO GSR 1, 2, 3 and from 4, 5, 6 they have both GSR & RS line-ups. Mitsubishi's GSR badged cars have turbo kit fitted as factory standard.
Cheers!