Quote:
Originally Posted by scott@bmwhn
I experimented with this but as stated it didnt seem to make much difference and if you dont secure the flap tight enough you'll get a horendous rattling 
...interested to see what your "stage 2" is |
I experimented this on my 335i as well (I know this is the N20 thread). No perceptible sound difference at all. Much ado about nothing really. I put it back to stock.