Wow... And the Jug and Corsair are designed around the Moki engines too. So your suggesting I look into strengthening the firewall area of my Corsair?
On the P-51 since it was never designed for the Kolm engine or the kind of power it makes Id say its a very good idea to beef it up AND look at the rest of the plane while your at it!
How did the firwall fail on your Jug? Rough landing?