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Originally Posted by XanthosV6
The intake should give you just about the same numbers. The exhaust probably won't be quite as good.
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It's my guess that you won't get REAL gains out of an intake or exhaust until you get intake, exhaust, and tune together. Until then, everything from the factory is probably pretty well matched.
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Not necessarily. From my experience the first thing they do when you bring your car in for warranty work is check the PCM for codes. They would be able to tell right off the back if a tune was done, I would think.
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Has anyone here used a Tech II, or whatever GM dealers are using for a scan tool these days? When you plug it in and pull codes, does it also check the last flash upload date or anything like that?
Knowing basically how this stuff works but not knowing specifically what GM's advanced tools do, I'd give it a pretty good chance that they're unlikely to accidentally notice it. If they want to check then it's probably very easy, but I wouldn't expect them to check every car that comes in. Also, if it makes the car drive noticably different (which is surely what you're going for when you pay for it) they could notice the difference and then check for modifications.