2017 A4 performance chip
You can do a swap for like $1400 and tune it and bam you S3 power Stage 1 style. I am not sure about the intercooler. if the A3 and S3 are the same size.
The IS20 is good for about 22P{SI sustained maybe max at 25 if you keep things cool otherwise you pull timing and 22PSI makes more power.
The IS38 will run around 33-36PSI tuned!
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