I too am new to this. Chose not to mod the car at all as I enjoyed as is. Now it looks like a DP cat or two are bad. Dealer cost is stupid so a quick search showed that Cobb is really a good option as their stage 2 comes with catted DP's. Mine is a pretty early 08 so it sounds like the N54 AP is pretty well sorted. Are the only concerns in this thread from the lack of support for the N55 version or are there issues with the N54 version.
Thanks
Joe
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