Just changing the filter and slip ons is not a stage one, I see no need in spending money on remapping for that but I would go with the K&N filter it definitely breathes better than a stock air filter. Imo
research some more. while a K&N may breath more than a stock 2014, in fact test have shown the 2014 stock filter breathes as much as a stage 1 can handle. so no benefit in being able to breathe better.