A tune is not provided in a downloadable rom man. You need to take it to a shop that has a wideband o2 sensor, and adjust things like timing and air/fuel ratio to actually get a proper tune.
Since your pretty much stock, unless you feel it's fit to spend 300~600 for a tune, I would use the stock rom for your motor. The first link would be for a stock USDM engine, and the second link would be for a stock JDM engine.