Originally Posted by phil200tdi
Its a google image.
I have an E90 so mine is slightly different - I have Catless DPs and stock from there onwards.
My assumption is that the X thing is to mix the exhaust gases in the mid pipes, its not big enough to be a muffler. The link between the two rear boxes does the same and apparently helps to reduce drone.
I would add a pair of resonators to the catless mid pipes smoked is selling and away you go!
Thanks..still weighting up my options...Mot after xmas so might just leave it till after =]
MY08 E92 335i M Sport|Wrap by Surrey Project |ETS Intercooler|VSRF Dp's|BMS OCC|BMC filter|CoBB AP|EBC Yellow & Coolcarbons rear|Alpina AT Map|Michelin PSS |CF grills,CF mirror,CF Performace spoiler|LCI light|CIC controller retrofit|2014 Mods: Birds B3 Suspension kit,Project Mu pads,Afe Filter and PTF Protune & Pilot sports cups. Gone:Forged FMIC, Eisenmann Race Quad, Eisenmann Sport Dual, Duke Dynamic Diffuser. Eibach Pro springs.