r33_RGSport it seems like n55 F15 DPs are slim pickings online. I am going from MHD stage 1 to stage 2 and it appears that a high flow or catless DP is required. Prefer catless. Also it is my understanding that flash tunes, such as the OTS MHD tunes change the parameters of the O2 sensors so that a catless or high flow don't throw CELs. Is that accurate or will a simulator be required to prevent a CEL throw.
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