It won't blow up. You'll be fine as long as you're not beating the
snot out of it every chance you get. It will run a little lean, but IMO not enough to do damage. You really do need a fuel controller as soon as you can.
I know I tried it and did not see a difference in plug color. The altitude where you ride has more of an effect on whether or not you're too lean with a slip on and no controller than just the slip on itself. There are too many people that have done it and still do it with no adverse effects. But either way you do need to get a controller to get the most out of the pipe and adjust for future mods.
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