I recently purchased a '91 MR2 Turbo that is having some issues. A little bit of history:

This car was not purchased stock and has the following modifications that I can tell. Here is what I know is currently on the vehicle.

After Market Huge F*** off Turbo (Not sure what it is though)
Stock Intercooler
4" Intake pipe
NGK Spark Plug wires
ApexI Super AFC
HKS Vien Pressure Converter
Greddy Boost Controller PRDFEC-v
...

whipit