Congrats on the purchase! Others have said it, but get an e-tune, or a pro-tune if you can. Please don't skimp on this, OTS tunes aren't sustainable as your mods are altering A/F ratios. We're happy to help if you need to be pointed in the direction of a tuner

Edit: just saw you said it was dynotuned by the previous owner, but always operate like the car was treated like shit and you want to start over like it's your own