Great job guys with this thread. A lot of good info.
I'm running a 2014 550 xdrive and this was some of the info I've been looking for. I've got 60k on it now and been running RC Ultimate -- C setting. Been okay, but I need more.
New plugs will be in tomorrow (NGK, 1 range colder). Going to go with BM3 and probably get the whole map package as well. I've been running e85 in my play car for almost 10 years...its like $2/gal race gas. So, E30 should give me a little bump in timing.
Stock cats for now, but seriously thinking about going catless. Just dont want it to sound like crap. Need to hear it in person I suppose. Either way, I go to the track pretty often with my other car, so I'll report back any findings and post em up. I know this is a F15 forum, but we share the same engine
