found the issue, there is an exhaust leak from where the test pipes meet up with the stock pipes. You can see exhaust "residue" around the collar that holds the 2 pieces together. I am going back to have it fixed on Thursday @ the shop that installed them. Not sure if its a design issue or if the dealer somehow messed it up, but the pipes look a little misaligned. I hope its an easy fix!
E90///M3 : ESS ECU & Shift tune w/ full ESS exhaust | KW V3's | LUX AE | 19" TE37's | Mode Carbon V1 lip | JB's CF trunk spoiler PARTING OUT EVERYTHING, SEE RESPECTIVE PARTS UNDER PARTS SECTIONS