coming back from jap show last sunday i noticed white smoke coming out the back when changing from fourth to fifth and again from fifth to sixth. it only happens in these two gears and when driving in a "spirited" nature. I have checked all fluid levels and these seem to be normal. the problem is the same whether the engine is cold or hot. the exhaust has also been popping but have been told this is normal, just unburnt fuel/gases, burning in the exhaust. if anyone could shed any light i would be grateful otherwise its off to garth next weekend.