Why not just get some quality catted DPs? You are not seeing that much additional benefit I presume with catless. The catted REALLY ramp up the turbos fast. There have been issues with rattles, CEL, odors, etc. on these AMS pipes. Gluttons for punishment? I run nice quality double walled (just like OEM) catted DPs and you would never know they are there except for the performance boost.
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