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Hmm,
First is the differential ratio.
You have a 2.79 to 1 ratio.
Putting in a 3.42 to 1 is the best change for the $200 dollars it will cost.
Next is a change of ECU to a later version of the 027 ECU that has a chip that is not soldered in. Adding a chip on an ETA provides the biggest percentage change in ANY, car chipped.
Around a 20% jump in torque and horse power.
That should provide you a good starting point.
Later,
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