For what it's worth, if the engine has been to TSR and had that ammount of work done (unless you have documentation to say otherwise ofcourse), I'd be very suprised if there's not been some mild head work and a cam of sorts.
If anyone was thinking about that level of tuning, and missed the opportunity whilst the engine was in bits needs shooting !!!
If that's the case - still with the 8V. It should have good performance with loads of life left ....
(Here's one for you K Jet boys, is there a soft limiter as with the digi GTI's
When's it kick in ??)
knobby - at what point in the revs can u feel the power tail off
If it's higher than about 5000 rpm then you might have more than u thought