Thanks! Regrading the fuel system, most issues revolve around the pump and injectors. I would recommend checking when they were replaced, if they have 60-80k on them then they are rearing the end of their life depending on use. If you aren't sure when they were replaced then it wouldn't hurt to replace both items, they are not cheap but if you plan to have the car for a long time it's a necessary maintenance item.

 

 

Sounds like you are going through all the preventative maintenance before mods, smart move. Don't forget to throw in some new plugs and get the intake valves cleaned, they both make a big difference, at that point if you ever get a misfire you can assume it's a coil and diagnosing would be easy.

 

 

Open your wallet: BMW E60 N54 535XI Catted Downpipes - ARDOWNPIPES

 

Gooo! Need to have cats.. The wife hates the old car smell and being environmentally conscious I really dont want to run open. I may try some universals post down pipes. You still running 3" all the way back or doing 3.5"

 

Still 3" and I don't plan on changing that although not ideal it certainly can support my ~600whp goals and I love the sound of my current system and don't want to risk changing/ruining that.

 

 

Yes, a few iterations but all played around with different setups that cost a couple hundred dollars to execute, current system was ~$2,500. Good thing it's the best sounding N54 I have heard! lol

My FWD system never failed per say but I had some issues with the front axles (CVs) the switch to RWD was one for simplicity and reliability since I knew chances were good a serious issue would arise at my power level. Originally I would launch the car when it had a tune but once the power got to the 450-500awhp range I limited boost in first and never did launches from a dig.

At first I disconnected the axles, swapped DSC modules, disconnected the TC actuator and module, and tried some coding but it didn't really work. Next was swapping the trans and more coding which still hasn't come full circle since the DSC/ABS is still inactive. Now I am in the last phase which is a complete M5 front subframe conversion and hopefully coding to enable DSC/ABS.

 

It does sound sweet! Sounds like it would be at home on a racetrack or a supercar.

Gotcha. I am thinking about running a M5 rear diff and keeping the front diff then running staggered 19 and 20. Should work just fine, just need to turn off the E-diff. From what I have seen the computer doesnt care about the small difference, Mechanical binding does and the 4% difference in tire size should match the 4% difference in ratio. Tell me if I am crazy.