The only issue you might have is those who live in states with emission testing and I really doubt venting to the atmosphere would affect the testing but would rather give you a cleaner test result.
Worst case scenario, you switch it back before testing, 10 minute job.
Vent to the atmosphere is not a 25 years to life crime folks, emission testing sites don't know the difference and could care less, your engine either passes or it doesn't and venting won't be the deciding factor.
If your car, truck, or motorcycle fails an emissions test you've got something else going on.