The can itself doesn't get too hot. As long as it's not touching the case it'll probably be OK.

The documented problems withe the MTC single can melting OEM top cases was down to the hot gases leaving the can, not heat transfer from the body of the can itself. Just make sure there is nothing in the line of fire of the gases leaving the can.

Can you post a couple of photos showing how close it is and how it's all lined up?

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