The first modification i done on this car is installing an aftermarket air filter which is from Apexi. Since my standard box air filter already in bad conditions, i decided to change to open pod. i bought an original Apexi from Kakimotor in Mid Valley, and i have to admit it is quite expensive. I got the air filter for rm260, but u guys can get it cheaper at other shops which varies from rm230-rm260. Overall, using an aftermarket air filter will not give much increase in horsepower, i didn't feel anything after installing it. But according to some research Apexi air filters is the best in terms of filtration and power increase.
This test were conducted on a Toyota Supra, which shows that Apexi have the highest gain in terms on HP. Test were conducted on dyno and with the hood open (air flow in the engine is at maximum potential). But however, for me aftermarket air filters will only add HP in the range of 1HP maximum!
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