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Best bang for money is chipping, you should see from 30 to 40 HP gain with no issues.

ECU is under windshild on drivers side in engine compartment.
Behind firewall, black plastic box.When you open it inside is ECU and on it you will find both BOSCH part# and VAG/VW part #. Other way is to Vag-Com your car and it will give you your ECU #
 
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