I’m looking to add aftermarket parts to my 08 Mazda 3 HB. Any recommendations welcomed. 🙏🏼

So I bought a cold air intake from protuninglab, installed it and then get a check engine light. I noticed a decrease in power but as I drove on it, it would subtly get better. I next reset my ECU by unplugging my negative terminal for a bit and tried the break pressing too. I noticed a much...