Tim at ACT Performance Products sorted me a set of the track day silencers. First set were a smidgeon tight and so he took them back and sent another set slightly stretched that fit perfectly. Hopefully removes any noise related risks on the day!
Those look heavy, what do they weigh? Leaving them on might weaken the welds further up the system.
The light at the end of the tunnel is actually a train. 2019 M3W