I just bought a J-Spec T2 motor (s4) to install in my 1st gen GSL-SE. To make things simple im going to be installing a Microtech ECU instead of trying to use a Stock Harness. What can i remove that won't be necessary for the engine to run such as emissions wise or anything else. Also right off the bat the car will have a 3" Exhaust along with intake...Will The Fuel pump will have to be upgraded? Boost wise its going to stay stock levels for now. The primary injectors will be 680cc and keep the stock secondaries for now.

Thanks alot

 

The entire vacuum solenoid and rack is redundant. The CAS stays but the coolant and air temp sensors and the TPS get replaced with the Microtech ones. Absolutely. The stock 1st Gen pump wouldn't be suitable for a stock 13B, let alone a modified one. Other way around. Leave the stock primaries and upgrade the secondaries.

 

Yup!

Nope! The Microtech isn't shipped out with new sensors. You let them know if you are going to be using stock sensors or GM sensors and they preprogram the ECU before shipping it out. Then it's just wiring in new plugs for the sensors (or reusing the plugs from the old harness).