Upgrade for Thiel2.3 driver

I recently cooked one of the mid/tweeters in my 2.3's and had a friend of mine who is in the audio biz order me a replacement.He took it upon his own to order the upgrade kit for both speakers, for me at a ridiculously cheap price.No Problem. My questions are....1-How much of an improvement did it make? and 2- He tells me there are some modifications to the speaker that need to be made.Has anyone done this upgrade and what is involved.I feel I can perform the work as I am in the electronics business and he tells me there detailed instructions anyway.I am just curious.Thanks for the replies.
Dave