I was driving it before after I fitted timing belt and done a wheel bearing it was driving fine it's only after exhaust manifold and inlet manifold and agr valve all been took off oh and turbo pulled apart to get the pig of a bolt out that it's all been put back together the pipes are swelling up badly you can actually hear the turbo spooling up and the whistling seem to go with the revs of the engine and it's down on power please help at my wits end