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Currently there isn't a whole lot of parts out for the N55 yet. N54 on the other hand has been out for 4 years and there is a plethora of parts and better performance upgrades. I have the PPK Stage 1(came with the car) and its fine for the mean time, though its not super fast either... But best bet we do have either JB4 / Procede / AA Tune / Dinan Stage 2 for the meantime and hopefully more down the road.
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Was - 08' E90 328i|Sparkling Graphite Metallic|AA Tune|Steptronic|Navigation|Comfort Access|Sport|Matte Black Kidneys
Now - 11' E90 335i Performance Edition|Space Gray Metallic|Sport|Premium|Navigation|Steptronic|JB4|E R Charge Pipe|HP Autowerks Foam Filter
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