Eisemann exhaust is bad ass, but I just cant take all that obnoxious sound for one day. RPI is probably the best way to go for the buck.

 

Awesome sound. How loud is it inside for daily driving?

 

lol at you racing your BMW at the Mercedes-Benz dealer right next to you the sound is just amazing!

 

It's louder than stock but not too loud inside, I can listen to the music but the Logic7 needs to work a bit harder .
The sound at around 2500rpm is almost the same as stock so in city traffic I do a lot of up changes.
I managed to get a better fuel economy too with this exhaust due to the early up shifts

The problem with this exhaust is... you love it or you hate it, there's nothing in between.
It's no way louder than a Porsche Carrera GT with straight pipes but people expect at least that car when they hear me riding down the street.
They almost look annoyed when they see it's 'just' an M5.
Got a lot of thumbs up though from people with other exotics, last week I had a Lambo Gallardo on my tail who was struggeling to get past.
At the traffic lights he rolled down his window to ask if this was a 700HP G-power M5 .
He didn't believe it's a stock M5 with an Eisenmann.
He also told me he was going to buy a new exhaust for his Gallardo since he didn't hear his own engine anymore when he was behind me at full throttle.

 

chu kwrazy!