I kinda agree. Once you star changing PARTS, you really certainly ARE tuning. And I'll also say this. With stock and milder builds, the chance of one being right out of the box is greater. When you start having big intake manifolds, free flowing headers and exhaust, more compression and more cam, that's when you actually need to start tuning. Since I tune old school by reading plugs and feeling driveability, I can have a month or two into getting one tuned correctly. ......which is how I actually prefer it. I've thought about an air fuel gauge, but as long as I can tune "my way" and get it right, I'll continue to.