Sounds like the OP should have gotten the BMW Performance Exhaust + Cattless DPs if loud to wake up the neighborhoold is what you were looking for
I am kinda suprised though with your the Dinan FFE + Cattless DPs that you considred it "slightly" louder than stock. I am runing highflow catted DPs and it is "MUCH" louder.
It maybe due to tuning, temps and air
Anyhow here are couple of exhaust clip with stock DPs and highflow catted DPs
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