I have been very sceptical about this posters comments through all the threads I read through, his demina is enthusuastic but uninformed and his comments are helpless and contradictory and if you can make any sense of his words your lucky. But saying youcan't tell, that is complete rubbish, I went from the bluehead Vspec to a Speed 4 months ago and have noticed that along with smoother power lay-down and geting another 1:20/tank at race pace it actually looks nicer through my shell than the blue did.