I just had my full Akra exhaust installed yesterday. I did not want a really loud exhaust but wanted performance gains and wt savings. I was under the assumption that the sound was not much louder than stock. Believe me it is louder than stock! At idle it has a much deeper rumble and you hear it in the cabin. Wonder what my wife will think when she returns from Italy? I have a track day today so will be able to comment more but one thing is for sure it is not going to be too subdued for this 60 year old. Mine came with the deleter module so for now at least no tune.
2015 f80 M3, 2010 GT3RS