As Chris mentioned, it definitely sounds like you're getting unmetered air into the system, and I understand returning it to stock, but easier for us (or anyone) to diagnose with it on.
Did you happen to get the CEL codes from the dealer? Guessing it was a MAF code since they inquired about it.
Simple checklist.. did you use the t-bolt clamps (the thicker ones) at the middle of the intake, and the smaller worm drive traditional clamps at the throttle body? The t-bolt will have difficulty due to how thick they are up there.
Our shop has been very busy lately, it's the balance for guys to figure out if they want to install stuff themselves or just have our guys do it, and lately it's been the latter.
Happy to help and make sure you get taken care of. Let me know what you want to do, just shoot me an email at josh @stillen.com, I'm sure we'll get you squared away.
Josh
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