Yeah theres been no changes since the car was tuned. I might bring it back today and sus it out. Cas yeh, every so often, its a loud crack coming from the exhaust, not the normal deep pop.

And i know BOV is a blow off valve, it came with the car so i dont know what kind it is..

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MY02 WRX STI

Full Cosworth Internal Rebuild, Autronics tune, Cold Air Intake, 740cc Injectors, 3" TBE, 600hp Fuel Pump