What people are not considering is the size of piping and air flow. Even though you put a bigger/better exhaust on your car, hfc's and a intake doesn't mean that your car will adjust to those parts. It will max out on its default settings because obd2 was designed to compensate for variations such as temp, altitude, timing, air flow. It has basic pre set settings that are determined by size of stock exhaust tubing, intake design, stock cat cels, etc. If you throw your parts on and don't tune it (as stated before) you aren't getting the performance (not peak hp but rather full band increase in performance) that you paid for. The pre-determined settings are going to be maxed out, which is why a tune helps because it sets new parameters for air flow issues with hfc's or temp issues with cold air intakes. Feel free to chime in if I am wrong, but that is the way that I understand how the uprev helps.
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