Orca TX ?
I run a 20t on mine, it did get hot but it won't thermal on a run, maybe lower the punch a tad and remove any timing/turbo, I'm on 5 punch on my XB4 2wd but I use an Orca speedo (with fan) with a 120deg thermal cutoff.
I put ceramic bearings and alloy plate on my motor and lost 15deg overall.
I'm still considering running a 19 to lower the temp a bit
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