Okay, you seriously need more detail in that advert. I'm working off the PH one as it's much more user friendly.
First off, make the first pic this one:
That shows the car in the light, much more attractive shot.
Now, change that text as a single paragraph is hard to read. List your things out, so like this:
XXXXX miles
MOT expires XX-XX-XX
Last serviced XX-XX-XX
Where where the services done? (why did the car go 5000 over one service interval?)
When were the services done?
When did you do the mods?
Are the tyre sizes correct?
Where were the mods installed?
Etc
As much as I hate to pimp myself, this was my ad on here. Now the PH version had more pics, and I know a 911 has more options, but that should give you an idea of what I would expect to see in a decent advert. The more detail you give them, the less chance you have of numpties ringing up and asking silly questions.