Bang for the buck:
High flow panel filters (e.g., K&N), high flow cats or resonated test pipes (or ebay test pipes if you can dodge emissions testing, and don't mind some rasp on decel -- could be CEL issues with test pipes and no tune, tho') and two to three sets of ARC cool fins plastered to bottom of oil pan (remarkably -- this pulls oil temps down by about 10 -15* F).
All of that will give you a nice bump in power for very little money and help keep oil temps lower. I never see over about 220* F beating on it in the summer in FL. Every engine runs a bit differently tho', so see how yours does before deciding on the oil cooler.
Also, if you do decide to get one, I'd spring for a 205*F thermostat -- the 180* ones tend to run very cold in the winter, and do not let the oil reach optimal temp, which is about 200* F even.
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Enjoy it. Destroy it.
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