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You will see more smoke when you go catless. alot of people have this problem as soon as the go catless. How many mile are on your car right now? you might wanna check if you have a leaky oil filter housing gasket or leaky valve cover gasket that might be the reason why your losing some much oil.
As for the smoke from the car take the reading of your cooling fluid and see if it drops down, if so you might have a bad head gasket. if that checks out then i'll start looking a your turbo seals.
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