Maybe you have a whole gsr engine, of maybe a ls/vtec. Look at the bottom left of your block to see the block number. B18c1 = usdm gsr, B18c5= itr, type-r, b18c= jdm gsr, b18b= non vtec (ls,gs,rs). Ls/Vtec is a b18b block with a vtec head. You probably have a modified ECU because on a gsr the vtec kicks at 6000rpm and the cut-off 8600rpm (redline 8000). Vtec light is weird and definitively an aftermarket part.