You don't need to re-tune after those mods. Simply undo the battery terminal after the install and your fine. I started out with those same mods and have had no issues. I since have actually added a tuning module for a custom tune, and a HKS full blowoff valve kit (it's never enough
), but have never had an issues. You're fine with going with a SRI and the blow off plate. I am assuming you're going with Torcon? Also as a sidenote, the Dodge SRT-4 has the same venting setup as the Optima, so you can pick up an SRT surge valve cheaper than the Torcon if you're not going for the red/blue color in the engine bay.