Exhaust - Crackle & POP - Gurgling

Hi All,

I am looking for a way to increase the exhaust crackling, popping, gurgling on up / down shift, as well revving.

I have fitted the MPE and does crackle / pop softly when reducing speed, but I would like it louder. Fitting down-pipe, removing cat's not an option.

Please give some advise, also if it can be done with coding ?

Thanks
Djaak
M235i MPE