It is the speed of the airplane that is used to determine if the wing needs strengthening not a "screaming engine". If you are that concerned about the welfare of your engine, airplane and radio equipment then do the modification anyway or, buy a racer that is meant for the job.

To apply a slightly more scientific approach, figure out the expected speed of the model. for this you will need to know the pitch of the prop and the approximate flying rpm of the engine.

Pitch x RPM x .000947 will give you a THEORITICAL mph. This is of course ignoring all prop slippage etc. etc. Anything over 120mph and I would suggest the whole airplane is looked at, not just the wing.

If you do a search you will find countless threads about strengthening this airplane. To me it seems pointless to buy an ARF and then do all of the work that is suggested to make it flyable. Why not build a racer properly in the first place?

Ed S