I think it sounds like if your at 6,500 Rpm when you get torque your not in a GTI, sounds like an rx-7. I have Been warned about Driving the car hard and then shuting off right after. You need to cool it down other wise the oil gets cooked inside the turbo housing. This causes more problems than anything. I give my car about 5 minutes (when i have the time) to warm up, and about 5 minutes at idle for a cool down before i shut her off. But i have been found to be a bit of an extremist. And Turbo Lag is increased with this build up of sludge. (when nothing seems to happen when you "Mash the pedal")
For me, i plan on doing a few basic mods that i will share.
* Upgrade My Turbo, Garret is Best...and add a water spray to that, just a fine mist directly on the exaust spool, you never want to cool the turbo too quickly for fear of cracking and warping, but on hard runs while the car is still running i think its fine, and at idle for about 15-30 seconds when you've parked.(not tested yet.)
*Upgrade my intercooler to front mount With water spray.(tested and reliable -seen on WRX)
* Cold Air intake.(Air is drawn in from outside the engine compartment)
*High Flow cat/Free flow ehaust of any type (i prefer no resonator)
* And Chip.
$4600 -estimate. 20-35 % power gain. with exelent reliability from heat control.
* Intercooler vent plate for the wheel well on the passenger side behind the intercooler. (water spray if budget allows)
* Cold Air Intake.
* Remove resonator and muffler/silencer and replace with after market exhaust.
Under $1000 -estimate 5-8% power gain. Better cooling of intake air than stock, better air flow overall.