Ive had a Apexi air filter and the groupbuy intercooler fitted.
It sounded great originally but the other day when i booted it, it started to whistle
louder like a choo choo train.It actually sounded like it was leaking but upon checking I couldnt see anything wrong.
Next day took it for a spin and it sounded back normal.
Hold boost find but cant be sure as I have no boost gauge.
could it be my HKS dump valve
?Anyone have a clue?