This kind of oil consumption is completely unacceptable and you should elevate this to GM if you are being blown off by the dealer.
Amsoil isnt going to fix it and there is no reason to spend that kind of money on oil when no less quality oils are available at half or third the price of amsoil.
Downpipes without a crossover on an LF4 sounds pretty bad. That was understood a few years into the ats-v life cycle.
And the deal about downpipes without an CEL.....If they are not reducing cat efficiency (since there is no CEL) to flow better, what makes them less restrictive than OEM?
Its a direct linkage, not a cable. The shifter is mounted right on the transmission so yes it will vibrate. I also noticed this characteristic when going from a wrx to an atsv. That's why it is so direct. Nothing to worry about.
I reached out to them about adding a resonator to the loud path as I don't like the sound of the straight pipe exhaust on this car. They can do it for an nominal upcharge. The whole exhaust was quoted under $2k shipped. Its a good option.
I ended up doing my own thing similar to the OP's, which...
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