I bought a used a4 usp and so far i have found the previous owner instlled a milltek exhaust a custom hidden subwoofer encloser and yesterday I also found a milltek high flow cat.
I was thinking about getting the APR stage 1 with new injectors but shoot maybe this guy already has it.
My question is to those that have the ECU where would i find it and once it is chipped do they engrave the outside of the ECU box or anything?
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