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Hey,
I have the same exhaust and if you look closely the valves are marked as QTP. They are known to seize. All brands are. They need constant service which is a pia.
I suggest you manually open the valves and see how you like it. You get used to it quickly and it sounds awesome. I neber want my valves closed. However, if you have catless downpipes than it's another story.
Install is a headache. 5 hours /$500 total sounds fair. $1000 is not.
Best of luck and please post your results for others.
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