Heard both Akra and Dinan full setup in person as CashOnly has Akra full setup and I have Dinan full setup.
Both sounds amazing. It's more personal preferences.
Dinan has Dinan's tone (can't explain but all Dinan exhausts have same style nice deep/mean tones) and Akra has very Titanium + european exotic tone.
Dinan has no cats compare to Akra but Akra weights nothing while Dinan weights quite a lot.
PAST: 14 F10 M5 | 11 E70 X5M | 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3