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· A dashingly handsome oversized Guinea Pig
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Some questions I still have, are the carbon buildup issues still present in the 18's as far as we can see? I know it's the same engine, just curious if any small changes were made that don't get marketed.
It's the nature of direct injection. Catch cans, EGR and TGV deletes will help, but only slightly. Putting in a twin injection system is really the only thing to quell it.

What's the best way to find out if doing these deletes will put you at odds with your states emissions testing? Also, the dealers warranty?
It is 100% at odds with all states and federal emissions regulations and therefore illegal without any grey area. Some states just don't bother to do emissions testing.

To do any of those mods you will have to tune the engine. At that point just about any engine failure is coming out of your pocket. There is nothing you do that will good the entirety of the warranty in one shot. Just the system you modify and components affected by it.

Is an AP required for these modifications? Is an AP required to get a protune?
As far as I am aware the Cobb accessport is the only tuning solution for the 15+ at the moment. So yes, you will likely need one. They run about 650, and the average tune runs around 500.

Lastly, are there any other concerns with the longevity of other parts in the car since you are increasing air flow and output of power?
Any time you modify anything on your car for power you take a direct hit to reliability. How much of a hit? Some cars won't see 50k miles stock before blowing up, others will go 200+k with basic bolt on parts and a good tune. The fa20 has had both piston failures and rod failures arise, so for my money I would enjoy the factory warranty for as long as it lasts.

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