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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
The stock y-pipe is the biggest POS I've ever seen (take 2 pipes and crush them to fit into a slightly bigger one) and plenty of guys have swapped it on their 3rd gen's. If you're already doing your exhaust then it's a good time to get one and have it put on.
The stock Y pipe is minimally restrictive to say the least, I don't think it's a worthwhile mod unless you got money to blow on 1hp gains.
That Y is quite restrictive if you compare it to how is SHOULD be. Although it doesn't yield massive gains to just change it, it definitely helps if you are making other upgrades.