Well, I just tested out the Howard 500 engine tunings I performed On my Brian Gladden Beech 18 Volpar.  She is extremely overpowered now.  If I run more than 20 pounds manifold she will overspeed.  That happens at around 230-240 kts.  Now, what I would like to do is strengthen the airframe of the Beech 18 Volpar to make her able to use that extra power.  What specific lines in the aircraft.cfg would I need to change to increase her overspeed and stress limits?  I think she could cruise at 300 kts. if I could make her airframe take the speed.  How can I do that?  Thanks guys