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@ ALL - so comeon you wizzes out there, why is this backfiring occuring?? I would have thought it is due to an excessive amount of fuel vapour passing through the exhaust unburnt and then igniting / rapidly burning as it reaches some part of the exhaust chain....? It is interesting to find this out though - as Wurzel recently put on a new BOV (50% VTA, 50% Recirc) , and now his exhausts sends not just shock waves but explosive pops as he lets off the excellerator.