I would go with the largest you can ,the factory rubber mini snorkel on the factory lid is 2 inches .
A kit is nice because they did all the fitting/ routing for you, just be aware that adding the kit will most likely change your air fuel ration. You’ll most likely have to add a fuel tuner.Thank you Rob. That would be the Go Deep kit. I’ll keep looking but there doesn’t seem to be many options out there.