Awesome,
Respectfully, that much power in this aircraft simply makes no sense. Please realize that, unless you're a structural engineer, there are many areas of the structure you may not realize are going to need structural attention to avoid failure as a result of your choice of powerplants. This model is intended for up to a 2.7, and your 4.1 SINGLE is going to shake the beegeebers out of this aircraft.

So while you may feel comfortable modifying your model in this manner, I can't encourage you strongly enough not to recommend such modifications as many modelers who might assume that this much power must be required based upon your post will likely NOT have the ability/know how to redesign the bird for this type of use.