Maybe this particular CT cylinder yes. But not all big bores. I have ran 2 Blasters with 240 Vito's for MANY miles and not had much of a problem with either. No more problems with them than the stock bores. I have seen some CT cylinders running awesome for years and years. Either this is a rare occurrence with CT kits or their products are REALLY suffering now.
ok..... my argument will be "i don't have that much money to spend on a cylinder when mine is perfectly fine"