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Fitted my ECU and air filter over the weekend (JT exhaust to be fitted on Wed/Thurs of this week), but no Oh, my God stuff. It does feel faster, but then it felt very fast before. I am wondering whether the old ECU was messed around with (it did feel very fast) or if something is not quite right. The needle does go into the red, but not to the end, & it then backs off, even under hard acceleration Obviously, the boost will be reset following fitment of the exhaust, but I was rather surprised by the fairly small percieved difference after AlanB's experience. The dyno run on Saturday at Power Engineering will show me whether it is hitting Speedparts claimed output. Still, left a 3 series Beemer for dead going up a long hill today.