I lost 5lbs of boost,but what a differents

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My gasket came from coppergaskets in SA ( i think) They recommended coppercoat, which is what was used along with a sealant around the water passages. It virtually starterd leaking from the inlet side from day one. Started leaking from the exhaust side at around 800ks. Fortunately it is not getting into the oil. Bars leaks turns you green stuff a bit murky, but all you have to do is drain and refill. It has stopped all seepage in the 2.6 block