I think 9k is realistic as it is a well looked after low milage example. Most TT's of this age that are going 'cheap' need their cambelt done and a few other bits. Mine has had no expense spared and requires nothing.
Yes I do have the original airbox however is has been 'Waked'.
Standard alloys have legal tyres, not a major amount of tread left though.
In answer to aother question, yes the car will do 160+ Never had it up to 160 but have had it over 150 against a new CTR on a strip and it was still pulling like a train. A standard unrestrictd TT will smash 160

(QS and V6)