Back silencer box

[Beatleboy]

Hi , I think my back box is on its way out , baffle noise I would prefer to replace it with an aftermarket silencer with abetter sound ...any suggestions the one I have looked at seem incredibly expensive

 

[Althulas]

Why not try a cat back or full custom exhaust some members have done here and cheaper than say a einsmann back box https://www.proflowexhausts.co.uk/category/bmw/
Not sure which places members have used but could try a search on the forum for custom exhaust.