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is there any good or recommended BOV for 2.5L STI? we are having 1 on currently but ever since we install it, the power isnt that great anymore? im afraid that the person who help us install didnt adjust it properly.!

i've just changed my orginal air filter into HKS racing suction filter. but the workshop(sungbeng) installed the filter itself without the piping as my dad driven it to install. so now whenever we drive to a certain RPM, the air intake sound start to have gapping in between. is the piping...