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Agreed, PPK can't hold a candle to Cobb, JB4, etc in terms of sheer power. In terms of refinement it would be hard to beat though. Just decide where you want to go with the car and build it up accordingly. I travel quite a bit and wanted the peace of mind that comes with a BMW warranty good at any dealer, any day for any reason. There is quite a bit of misinformation circulating about these aftermarket tunes, be they piggybacks or flashes. The dealership diagnostic equipment can see precisely how often and when your car has been flashed and can see if certain parameters have been exceeded. They can see if you have been tuned regardless if the tune is still present.
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