Is replacing the stock airbox worthwhile for the Stage 1 tune? Also heard mixed stories about oiled filters, any input there?
Not really, unless you want the sound. Stock is completely sufficient.
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Is replacing the stock airbox worthwhile for the Stage 1 tune? Also heard mixed stories about oiled filters, any input there?
Yes the Intercooler goes a long way with this trucks and is the main modification I would suggest. The next thing in hotter climates would be a thermostat and when plugs start to get old and die, replacing them with one step colder seems to help a bit.
honestly tuning is hands down, the best thing you can do for these trucks. Once you do tuning, the Intercooler is the next best thing. After that, very little value is added in anything else. Unless you choose to go ethanol.