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Looks to be slits cut in the top and bottom of that pipe, so they can be expanded. Also a wire brush wheel in a drill would clean up the inside a bit and might also help.
As stated, hit up a auto parts store that loans out tools to get a large muffler pipe exspander (just need to leave a deposit if you don't bring it back) to expand the X pipes so the muffler pipes will slip right in. The large expander will do 2-1/2" to 3-1/4".
To use, you just put the exspander in the pipe so the back of it if flush with the back of pipe, crank the back bolt a about a turn once the expander is expanded out tight inside the pipe, then crank the bolt back down to remove it from the pipe. Hence pipe is already slit cut top and bottom, so we just want to expand the pipe enough (rounded) to slip the muffler pipes into X tube pipes.
When you tighten the band clamps back up, it going to draw the X pipe back down tight against the muffler pipes again.
Short of that, there is the clean up, WD40 and wiggle game to get the muffler pipes back in, but really don't want to do that, since before you tighten the band clamps back up, you need to get the muffler exist pipes level, and don't want to have to be fighting a tight fit there as your trying to level the muffler exit pipes.
Note, little trick to getting the exit pipes level if you are installing the mufflers yourself alone, use a piece of wood under the exist pipes leveled to the car on legs, to hold the muffler pipes level as your tighten the bands.
problem installing Corsa Extreme
