ya Dinan claims 4-6, seriously doubt that's noticeable. I was wondering if anyone had a dino run, but no one seems to care to check this. cat back exhausts are mostly just for the sound/looks.
I wonder if combined with a few other bolt ons and a tune if it becomes more worth it, but I have no idea.
E92 ///M3 in Dakar Yellow, M-DCT, iDrive, 220M OEM rims, Active Autowerke Green filter, Turner Motorsport test pipes, BPM stage 2 tune, Stoptech ST-40 F+R in yellow.