All Scoobs have a DV as standard, a recirc one which doesn't make a silly noise. The whole intake and turbo system is set up to work perfectly with it, giving a smooth power delivery along with reliability. Fitting a VTA DV instead can ruin that smooth running, risk reliability and make the engine run like a dog, whilst giving no performance benefit whatsoever. Many people perceive the sudden shut off of boost and the resultant surge of boost these create as attaining more power, but this is not what is happening and your car is much better running smoothly with the OE items unless you modify to a boost level which could split the diaphragm, although the later new-age recirc DV's were much stronger making this no issue. If you change to a MAF-less intake with suitable ECU, possibly with a FMIC, you can run without a DV at all, but otherwise, stick with the OE item and spunk the cash on suspension and chassis mods which will make your car both faster and safer, although they won't give you any power gains to brag about.
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Diesel, goes like stink. Eat my soot !
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