hey c-zero , thank you for the reply.. but i`m pretty sure my engine is a DOHC, erm.. well its stated on the brochures and i guess Honda-Malaysia wouldnt simply put the 4letters in. i`m not sure whether if its a k20a3 or a k20a2 engine , but my engine is a 155hp vtec.. i understand my car is only a civic , so of cause it`s nv as powerful as integra/RSX but may i know more about my k20a3 engine if that is... as in whats its capability and how would i be possible to boast the car into a much higher hp engine but safe ? safe in the sense of the engine wouldnt be overheat very easily and so forth.. thanks again..