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I have a 2001.5 B5.5 with the 1.8T at 167k miles, what should I upgrade before doing an APR Stage 1 Tune?

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Make sure all preventative maintenance is up to date. See below.
  • Timing belt change is most important.
  • MAF, intake air temp sensors clean?
  • Fairly new spark plugs
  • PCV system functioning with no oil leaks up top?
  • Axle boots ok?
  • When was the last trans fluid change?
  • Brakes in good shape? (you go fast, you need to stop fast)
  • No CEL?

You do need an upgraded diverter valve. common ones are below.
  • Audi 06A145710NKT AKA, the 710N from the 225hp Audi TT 1.8T
  • Forge Motorsports 007 or 008 diverter
  • APR R1 diverter
Those are the main ones.
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