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Ammonia smell from exhaust.

I drive a 2007 Toyota 4Runner. Recently the weather has been nice enough to drive with the windows open. I've noticed a very strong ammonia smell from the exhaust - so strong at times, that I have to roll up the windows and use the a/c. I use Shell gas with no ethanol, but it has a nitrogen additive. Is it the gas I'm using, or is there something wrong with the vehicle? It's definitely ammonia, and I can only smell it while I'm driving.
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