http://www.fiestastforum.com/forum/threads/464-Performance-Acronyms-Abbreviations-?styleid=2
4WD - Four Wheel Drive
ABS - Anti-lock Brake System
AC (A/C) - Air Conditioning
AFR (A/F) - Air Fuel Ratio
ATDC - After Top Dead Center
ATX - Automatic Transmission
ARK - Anti Roll Kit (Swaybars)
AWD - All Wheel Drive
BBK - Big Boost Kit
BDC - Bottom Dead Center
BHP - Brake Horsepower
BOV - Blow off-valve
BTDC - Before Top Dead Center
CAI - Cold Air Intake system
CARB - California Air Resourses Board
CAT - Catalytic Converter
CC (C/C) - Cruise Control
CEL - Check engine light
COP - Coil-on-plug
DSI - Dual Stage Intake
DSM - Diamond Star Motors
DTC - Diagnostic Trouble Code
ECM - Engine Control Module (sometimes referred to as ECU...Engine Control Unit)
ECU - Electronic Control Unit
EGR - Exhaust Gas Recirculation (as in "EGR Valve")
FI (F/I) - Forced Induction or Fuel Injection
FMIC - Front Mounted Intercooler
FP - Flex Pipe
FSM - Factory Service Manual
FWD - Front Wheel Drive
FWHP - Front Wheel Horsepower
GVWR - Gross Vehicle Weight Rating (found on door sticker)
HID - High-Intensity Discharge Head Lamps
HU - Head Unit (Audio)
IMRC - Intake Manifold Runner Control (control box for the DSI)
IAC - idle air control valve
IRS - Independant Rear Suspesion
ITB - Induvidual Throttle Bodies
LED - Light Emmiting Diode
LEV - Low Emissions Vehicle
LSD - Limited Slip Differential
LTH - Long tube header
MAF - Mass Air Flow
MAP - Manifold Absolute Pressure
MFI or MPFI - Multi-Port Fuel Injection
MIL - Malfunction Indicator Lamp
MOD - Modification
MTX - Manual Transmission
NA (N/A) - Naturally Aspirated
OBD - On-Board Diagnostics
OE - Original Equipment
OEM - Original Equipment Manufacturer
ORP - Off-Road Pipe
PATS - Passive Anti Theft System
PCM - Powertrain Control Module
PCV - Positive Crankcase Ventilation (as in "PCV Valve")
PP - Port and polish
PRS - Passive Rear Steer
PSI - Pounds per Square Inch
PZEV - Partial Zero Emissions Vehicle
RMM- Rear Motor Mount
RWD - Rear Wheel Drive
RWHP - Rear Wheel Horsepower
SAP - Street Appearance Package
SC (S/C) - Supercharged
SD - Screamin' Demon Coil
SRI - Short ram Intake
SRS - supplemental restraining System
STS - Short Throw Shifter
TB - Throttle Body
TBI - Throttle Body Injection
TC (T/C) - Traction Control
TDC - Top Dead Center
TMIC - Top mounted Intercooler
TPS - Throttle Position Sensor
TSB - Technical Service Bulletin
TQ - Torque
ULEV - Ultra Low Emissions Vehicle
UDP - Underdrive Pulley
VCT - Variable Cam Timing
VTEC - Variable Valve Timing and Lift Electronic Control
VVT - Variable Valve Timing
WHP - Wheel Horsepower
WOT - Wide Open Throttle
WTQ - Wheel Torque
WHP - Wheel Horsepower