It will make it run lean without a tuner. Not the best for the engine but okay for a little while; you'd want to put a tuner in ASAP. It will have a flat spot in mid-range revs too until the tuner is installed due to the decreased back pressure. Probably better off waiting until you can get both.I took the snorkel off my bike, it has a K&N air filter, and stock muffler. Would I be hurting the engine if I head the stock headers decatted and run it with that setup??? I know getting a tuner would be the thing to do but right now im short on funds and getting the performance of opened up headers for $40 doesn't sound bad but I'm not going to do it if I'm going to do damage to the engine.
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