hello, my car is 4G15 wira se 1.5 manual.. first i change the air filter to drop-in k&N. fc is quite the same unless i rev the engine, i think tht is normal due to more air being sucked in. so no problem. then, change to Denso iridium IW16 bought from tctho. aiyaa... the very first time i try the plug already sucked my petrol like vampire... very scared to push the pedal. my fc usually RM10 for 70km, now drop to about 35-45km for RM10. I drive my car to work, always traffic jam MRR2. even...
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