I was in the same boat as you last year, decided to go with the Fabspeed Highflow Cats and xpipe....never been happier, no codes to this day and a sound that rivals the best of them.
Check the video of my dyno after install.
Talk to Jeremy if you decide to go with it, he will take care of you.
AW E92 M3|E92 LuX|Piaa GTX H3| Rear Fog Light Mod | Ventureshield (Raja)
|Eisenmann Race Exhaust |Macht Schnell Filter | Black Grills | Black Sides | H&R Springs | Fabspeed X-Pipe & High Flow Cats| CF VRS II rep diffuser|Most powerful Scoops in the world|