[MINI-Morgan]

Will it handle the extra power? Yes probably wont even stress it much more but..... yes there is always a but with these things! Manufactures build in big tolerances into the gearbox because roads arent smooth and some people are heavy handed with gear changes. How many people rev the nuts off the engine and then slam it into the next gear and feel that big surve forward? Thats the big torque increase of slowing the weight of the engine down when its still going full bore! And when you go over bumps as you are accelerating flat out it goes loose and then suddenly tugs big time. So yes a standard box has alot of headroom but it depends how you plan to drive it. Smooth acceleration it will easily cope 300+ hp im sure.

The only reason I can see them upgrading the gearbox is to account for the extra stresses of being driven badly with the extra torque it now has.