A month or so ago I installed an Injen dual intake on my '07 335xi, then followed up a couple of weeks later with VRSF catless DP and the check engine light came on. I also noticed a black soot accumulation on the exhaust pipes. Installed Stage 2 LT aggressive tune this past Saturday and went for a test drive. Check engine light was out and the car ran fine for about 10 miles. On my return the check engine light came back on and car ran very rough especially on acceleration. Thoughts? I am planning to take it to my local wrench to get codes read.
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