My friends at Kaizen tuning installed my exhaust today, didn't get a chance to do any serious driving yet so not sure if there's any improvements. there is more of a growl at startup and it sounds deeper from outside the car. From my short drive today, it didn't sound any louder from inside. I expect it'll get louder after a few hundred miles. Here's a few pics and a short vid

2011 BMW 1M with Eisenmann exhaust - YouTube

 

Nice exhaust system for your 1M! Eisenmann is a very solid company/product. Did you get the Sport or Race version? Sounds like Sport from the vid. Should get louder after a couple hundred miles. Look into aftermarket downpipes for an even deeper growl and some more power as well.

Here's race:

Eisenmann BMW E82 1M Race performance exhaust system - YouTube

 

Congrats on the Eisenmann Race performance!

Now let's see some more GT-R photos

 

Since this is the ///M forum section, there is M content

 

It's their export (Race) version. I'm Waiting for some mid pipe and flash options to hit the market. Not in a rush since snow is just around the corner

 

Very nice, both of them! I have the Race version on my M3, love it!