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So I finally changed the setting on my racechip to e2 - which is the highest recommended setting. It does seem to help a slight bit more then the previous d1 setting. One other thing that I noticed is that the car seems to run a bit hotter (auxiliary fan has come on a couple of times since I made the change and I can only recall hearing the fan once prior). No check engine lights or anything though and the higher temps probably indicate higher efficiency too (other then possible heat sink with turbo I guess).
I also finally ditched the 18" stock wheels and run flat tires for some 19" Alpina rep wheels and non run flat falken tires. Overall, when it comes to mods/upgrades this change is a bigger improvement then the chip. I am happy with the racechip but the new wheels and tires transforms the car quite a bit more in my opinion.
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