Things I've noticed about full AMM and chips.
Chiptorque
$1000 to buy, install, tune, bleed valve.
$150 per hr to retune with any new mods...
Minimal places can retune, with about a 4week wait.
Keeps all the stock ECU stuff for A/C, cold start etc...
Easy to go back to stock if req.
Can only truely map up to around 7psi, from there it is a simple guess on how much fuel to add.... so if you run at 9psi and it is tuned at 15psi then the engine will run really rich until you put your foot down etc....
AMM (Haltech E6K)
$1500 to buy (sensors etc)
$1500+ to install and tune
$150 /hr to return. A lot more places can retune.
Re maps everything from cold start, A/C etc.
Can be used as a turbo timer etc....
Can truely map up to some rediculous boost that we will never use. And therefore you get a lot more power up in boost since it can remap the fuel alot more accurately.
A lot harder to go back to stock.
Personally, if I could go back in time I would get an E6k or similar, but it is just that much more expensive.... It all depends on the money.
Definately if I no longer had the stock turbo I would be getting a chip at the very least.... I'm surprised your car is still running.
Tripharn