Another of those things the car had when I got it was a pair of Vent to Atmosphere (VTA) Blow off Valves (BOVs) and I don't really like them. There is the argument that on a car equipped with AFM there is always unmetered air going into the engine when you release the throttle. While this is maybe true the fact that these valves 'dump to atmosphere' when you shut the throttle means there is no fuel being injected either so it kinda isn't a problem. However that's not the issue i have with them. The issue I have with them is not only do they dump air when lifting off the throttle after being WOT, the darned things sound like they are dumping on part throttle as well almost to the point of leaking when not hard on the gas. Anyways, managed to find myself a pair of OEM BOVs complete with the mounting bracket so I figured not many moving parts, 30yo or not they should work. I did buy new rubber hoses for them ha, OEM from Japan no less. I forgot to get the top hose but mine was ok to re-use and saved a bit of faffing around with the top one.
So how does it feel and sound after the changeover. Wonderful, so far. Nice and quiet though you can still hear some intake roar when on the power but no phsssssssssst when driving part throttle, no PHSSST when lifting off under heavish throttle loads. It does actually feel slightly smoother on gear changes as well, feels like it doesn't stumble / pause like it did before as the recirc works and likely the OEM units shut faster and stay closed more than the HKS units. Try and give them a bit of clean and then see if anyone wants them
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