They only go on one way, so you should be good. But you could always key the car on with the valves plugged in and not installed to make sure they default to the correct position then install them.
You should be fine on the X pipe. I have my Corsa axle back bolted up to a Borla 60608 resonated X pipe and it all fit perfect.
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2016 NFG 1SS A8
Options-2SS Leather/NPP
Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP
Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA
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