[NotGotABimmer23]

Originally Posted by Pizzaeatingking

I'm home now, had a little look underneath, I have a backbox, resonator, another smaller box and a cat so I *think* I'm in the clear. I thought the smaller box was the filter but from what I can gather they all have 2 boxes and a resonator.




There's a guy on the UK F3x page with an August built car, it sounds very good and has appears to have made no difference to the sound, same on the M140i with them fitted, dont seem any quieter.

From what ive read on babybmw the m1/240i sound significantly different with no pops or bangs at all.