[theplasticbling]

Once my warranty is up, I'll be tuning/deleting my 328D with the JR stage 3 tune. I'm going to skip the catback, cut off the muffler and just run straight pipe. Am I going to be rolling coal when I mat the car? Also, I've read up on swirl flaps and read that these cars don't have them, but then saw a post on another forum saying they do and they can be deleted. Can someone comment on this? Thanks guys.

[M4_GTS]

My E90 335d is deleted and it doesn't really roll much coal with a Dudmd Stage 2 tune. So I doubt the 328d will roll much since its a smaller 4 banger.

My Duramax is a different story...lol...it rolls coal pretty good.

[Enabled]

"Rolling coal" simply means incorrect air to fuel ratio, or even worse, improper injection timing. Too rich and you will start melting stuff when you sustain those EGTs.

I can make my 1.9 liter Jetta totally obliterate all that exists behind me with smoke, but that doesn't mean you should.

A proper tune will have little to none.

[Enabled]

And yes you have swirl flaps. They increase torque.
In F30 they are an improved design over the older cars, and are easier to maintain.

[rbreding]

My stage 3 doesn't roll coal but will emit a thicker "haze" during a full throttle maneuver.