Hi.. There.. I'm a newbie here.. Need some advice from u guys.. Currently i'm driving a wira with a 4g93 sohc.. Did some modification on it.. High Compression Piston (4G92P Piston), Port n Polish, Mat Speed Cams and a piggy back.. just change my gearbox recently to F5M222RRKE (previously was FM221).. Before i change my cam and gear box i manage to hit 180kmh.. After changing the gear box and replace the cam i can reach about 195kmh.. Is it the maximum speed for a sohc engine or there is a speed cut? Need advice and opinion.. Thanks