[sbtUK]

Here in Bradford, GTI stands for "Got Turbo, Innit!"

Trying not to repeat any, the ones I can think of off the top of my head are:

TDI - Turbo Direct Injection (Or maybe Tubo Diesel Injection?)
AWD - All Wheel Drive (A Subaru favourite)
WRX - World Rally Cross (And again)
STI - Sexually Transm... Erm... Subaru Technica International
VIN - Vehicle Identification Number
WRC - World Rally Car
VTEC - Valve Timing Electronic Control
DSG - Direct Shift Gearbox
ECU - Engine Control Unit
IVT - Infinitely Variable Transmission
DSC - Dynamic Stability Control
AMG - Auto Motors Group
DAC - Downhill Assist Control
TSI - Turbocharged Stratified Injection
CVT - Continuously Variable Transmission
ECT - Electronically Controlled Transmission

And for some reason I recall...

PSM - Porsche Stability Management
PTM - Porsche Traction Management

That's all I can remember at the moment :/
Sorry if I repeated any or got any of them wrong!