Have a 2008 Fatbob fitted with PC111 Rush slipons and Big sucker air kit sinc e new exhaust nuts keep coming loose causing back firing once tightend goes okay for 100ks and starts again now with 6000ks the air fiter element has cracked  the thread which holds the cover on anyone else having problems  Thanks

My mates Fat bob has had 2 air filters due to the nut breaking out of the centre, must be a common weak point, he put a pro heavy breather on it.

Thanks I have replaced exhaust nuts with locking nuts made for exhausts from bolt barn and they appear to be working and will get engine mounts checked