Usdmaf, if you have an Android phone you should download the Torque app. Then on Amazon buy an OBDII bluetooth plugin for your car. Once you do that, take the time to learn how to scan for knock and read other important gauges. After that, think about how far you want to go with your car. I would say if you want to drop to a 3.5" pulley and stay there, you could just buy a ZZP downpipe. With that I saw 0° of knock on a stock engine. But don't buy the downpipe if you plan on taking the car farther than the 3.5. I am camming my engine and just put headers on. My downpipe is now pointless.. lol
Best bet would be to buy the headers right away, you won't be disappointed. With headers and that tune you could probably drop to a 3.4 with next to no knock. But every engine is different. Read, read, read. Nothing beats knowledge
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