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guys, im not soo much of a noob, know how it works which is why i mentioned "assumed" in the post.. if i could run open dps i would! but i was asking this for people who know more than me about the n54 exhaust sys.. they are the same size pipes i was watching him weld.. my theory was that since theres so much flow the stock muffler cant handle it on a high map and it backs it up resulting in a power loss.. i noticed good gains on the stock map vs with the cats on the stock map but when i switched it up to high boost i was almost dissapointed.. im going to do some more runs soon and doube check.. my car likes to choose the days she wants to perform so.. and using the n55 dp would be interesting, id like to look into the sizes and such.. but thanks for the feedback guys
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