come back from a wonderful Mothers Day brunch...i was bored out of my mind driving home and apparently so was someone else so were playing a little cat and mouse when i finally get a chance to pass him im at about 5k RPM's in 4thand it kind of felt like a mild misfire but no CEL or anything it felt like the whole car was kind of bucking....so i just slowed down and continued home than 2 minutes from my house i get the CEL[:'(]dont know if it is related i will get it scanned tomorow...
but i also just put in a 5 bar FPR i had and was getting more boost from it so could this be the problem??? any geusses

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2001.5 A4 1.8t Quattro Sport

It depends on the code, if your boosting too much and hitting limp mode it would throw a code for excessive pressure of the turbo. Do you have a diode installed on the map sensor circuit?

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00 A4 1.8T

01 S4 SOLD!!!