i don't have access to a vag-com or anything like that, will i be ok with just a boost gauge if i only set boost to about 15psi. i'm only looking for a little more power.

YOu dont need to do the diode mod unless you are going to try running more then 21psi.

What chip are you running now? Because most of the newer chips on the market for the 2001+ A4 1.8T run around 18+psi.

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