I finally was able to take a couple videos of the E going through an underpass. The exhaust is an Eisenmann Race with no resonators. Yes, it is ungodly loud at WOT but relatively tame on the highway. Sorry for the low quality sound, the videos were taken on a digital camera.

2nd gear, about half-throttle, 3000-5000 RPM:

http://www.youtube.com/watch?v=bJwd3_a0z-M

1st gear, full throttle as soon as I enter the underpass:

http://www.youtube.com/watch?v=RtCbqy48BsA

Downshifting through the underpass. Gotta love those back-pressure pops:

http://www.youtube.com/watch?v=LGRanJNQbBI

Neutral revs through the underpass (this video gives you the best idea of how loud it is):

http://www.youtube.com/watch?v=S503V8dOkmo

1st gear, full throttle as soon as I enter the underpass:

http://www.youtube.com/watch?v=Dg95SmBzSgk

wow, that is loud!

How does it sound in the car with the windows up?

There is a decent drone inside the car but it is almost completely dependent on the load on the engine. In stop and go traffic it is not so bad but on a steady incline on the highway it gets pretty loud. Downhill on the highway it is almost as quiet as stock.

Sickest exhaust in the world! I want one but don't want the tickets that follow it.

sounds loud, good job... .... I have custom exhaust with eisnmann but I do run aftermarket resonators sounds more uniform...

Boston huh, i hope that thing pulls up on me soon

weak

Nice and loud Makes my E55 sound like stock

that way too loud

that remind me of the sound my as* make when I ate two giant hot bean burritos and a large coke..OMG!! you do not want to be in the same room with me after that

Yeah it definitely gets a lot of negative attention in that aspect.

Thanks. At times I wish I was running resonators. Like you said, it makes everything sound more uniform. But I just love how it sounds like a wild beast at WOT.

No such thing as too loud.

Hey I think I commented on one of your YouTube videos a couple days ago. Your ride is beautiful!!