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FWIW I have an e92 with CL DPs, stock midpipes with secondaries and stock mufflers with dimisa tips. I use the JB4 to keep the exhaust fully open and on a cold start in my garage I had my neighbors 5 houses down talk about waking up to my exhaust in the morning when I go to work. Its pretty loud but once its warm its quieter, I like it a lot and don't plan on changing anything except for maybe 100CEL secondaries down the road.
Side note, on a cold start it revs to a hair under 2000rpm before settling down a bit... This a symptom of O2 sensors or something? Or just normal?
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