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Unofficial Legacy GT “Stage Upgrade” Definitions

 

Stage 0: Stock with or without; panel filter / intake, or pulley

 

Stage 1: Stage 0 plus an upgraded ECU map/tune

 

Stage 1.5: Stage 0 plus a down pipe, and basic stage 2 map/tune

 

Stage 2: Up pipe, down pipe, upgraded stage 2 ECU map/tune. With or without Stage 0

 

Stage 2.5: Stage 2 plus a header, cat back exhaust, intercooler upgrade, further upgraded ECU map/tune

 

Stage 3: Stage 2.5 plus upgraded turbo, and stock fuel system

 

Stage 3.5: Stage 2.5 plus upgraded turbo and upgraded fuel system

 

Stage 4: Stage 3 or 3.5 plus upgraded heads or a full engine build

 

Stage 4.5: Stage 3 or 3.5 with both upgraded heads and a full engine build

 

Stage 5: Let’s dare to dream!!! Maybe fully built H6 Twin Turbo???

 

*Having an upgraded wastegate actuator, boost control solenoid, or TGV deletes are just pluses and do not fit into any one “stage” category.

 

**If you are running a methanol injection system you simply add a “+” to your Stage. I.E. Stage 2.5 +

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Is it possible for me to upgrade my navigational screen to possibly equal the later Spec-B's that being displaying more than the rudimentary MPG,and other such into a package that might indicate true engine performance.....is it a matter of replacing a chip or am I thinking of the impossible.i bring this up because of a later legacy display that gave truly useful intelligence .
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