The new owner of my previous M3W got stopped by 👮‍♀️ after two seasons of happy driving.
They had a focus on noisy motorbikes and the stage one kit of the M3W got their attention.
At a test the M3W was 12 db over the top / the approved level. (15 db would have resulted in an immediate loss of road approval)

Any suggestions for a simple fix to get the noise down?
Putting the famous pot cleaning steel sponge into both end-tubes was my first proposal.




Hannes
once: Green M3W; 2013
now: Red 4/4 Sport; 2011
and some practical cars for use in real life