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      01-12-2013, 07:08 PM   #1
F12M6MD
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My new Meisterschaft GTC exhaust...

Full cat back (LXR, SR, mufflers) GTC with EV wireless controller. 102mm tips.

Did before and after on same day with Mustang dyno. Only got 14hp increase with valves open (501whp; GTHAUS has speculated reasons for this over on the M5 forum, so exact #'s in this case are not too important). Did run with valves closed and power not significantly different from stock. Valve open sound is so mean! It is night and day. Starting the car cold in my apt garage with valves open sets car alarms off. The pitch of the exhaust is not as high as I thought it would be so my best description is freakin mean sounding. There were a few problems I encountered when installing:

1. Finding a good accessory power source in the trunk fuse box (a not always on source), but finally found one after looking at the paper diagram that's inside the trunk fuse box (right side). I can't remember the # off the top of my head.
2. Our first attempt at opening and closing the valves using the wireless controller, the valves would open only partially. We had to loosen up the valves and more or less center them appropriately so they don't catch on any piping when moving.
3. Only one of the two wireless remotes worked. One of the pieces covering the led light on the remote also came off (first impression was - I spent this much for this cheap p.o.s.). We fixed the light covering. I called GTHAUS and without hesitation they are sending me a new wireless box with 2 new remotes. Very good customer service.
4. With the big 102mm tips, it is pretty difficult to align the exhaust just perfect from a left vs right comparison (without one side barely touching the rear bumper portion. Overall, not too big a deal for me. But if you cared enough, you'd notice.

My overall impression is that I love the exhaust look and sound. I know my hp gains were not as impressive as GTHAUS has shown but the sound and look are more important as the car is plenty powerful for me. Here is a rear pic of my car. Any questions let me know.
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Last edited by F12M6MD; 01-12-2013 at 07:41 PM.
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      01-13-2013, 12:05 PM   #2
F12M6MD
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VIDEO: Dyno run with valves open

Note the downshift after the dyno run is completed. It shows how mean the exhaust sounds to me above the whirl of the dyno wheel.


Last edited by F12M6MD; 01-13-2013 at 12:11 PM.
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      01-13-2013, 01:17 PM   #3
F12M6MD
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VIDEO: Cold start and up to 4k revs...

Recorded with my iphone. Valves completely open. Cold start is very loud.

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      01-13-2013, 01:19 PM   #4
Jty421
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I just got the same exhaust installed last week but Passenger side Airbag light came on... Installer and GT Haus are tryjng to figure out what went wrong.....
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      01-13-2013, 01:21 PM   #5
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Quote:
Originally Posted by whiteonredm6 View Post
I just got the same exhaust installed last week but Passenger side Airbag light came on... Installer and GT Haus are tryjng to figure out what went wrong.....
Where did you connect your wireless controller power to?
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      01-13-2013, 03:09 PM   #6
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I have no idea...can you tell me where you connected YOUR wireless controller power to?
I'll pass it along to my installer.
Thanks.

Last edited by Jty421; 01-13-2013 at 03:29 PM.
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      01-13-2013, 05:07 PM   #7
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Hmmm, the HP to the wheels seems to be off for your dyno run? EAS had a stock F12 M6 put down around 503 rwhp with a bone stock F12 and you're saying that WITH the GTC exhaust, it added 14 HP and only put down 501 rwhp?
The other thing I noticed about EAS' dyno run, compared to the M5's they ran on different days, was the outside temp. I believe it was 20-25 degrees hotter the day they ran the F12 M6 (109 degrees?) compared to the M5's (70-88 degrees?).
A couple of M5's, which ran on cooler days, put down 25-35 more HP to the wheels.... Something seems off here since yours has a GTC exhaust and there is a gain of 14 hp?
http://f10.m5post.com/forums/showthread.php?t=745949

Nonetheless F12M6MD, you have a beautiful car and the exhaust sounds amazing too!
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      01-13-2013, 08:50 PM   #8
F12M6MD
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Quote:
Originally Posted by DiavelM3 View Post
Hmmm, the HP to the wheels seems to be off for your dyno run? EAS had a stock F12 M6 put down around 503 rwhp with a bone stock F12 and you're saying that WITH the GTC exhaust, it added 14 HP and only put down 501 rwhp?
The other thing I noticed about EAS' dyno run, compared to the M5's they ran on different days, was the outside temp. I believe it was 20-25 degrees hotter the day they ran the F12 M6 (109 degrees?) compared to the M5's (70-88 degrees?).
A couple of M5's, which ran on cooler days, put down 25-35 more HP to the wheels.... Something seems off here since yours has a GTC exhaust and there is a gain of 14 hp?
http://f10.m5post.com/forums/showthread.php?t=745949

Nonetheless F12M6MD, you have a beautiful car and the exhaust sounds amazing too!
Hey DiavelM3,

What can I say? I wish I could say I got better numbers stock and with exhaust. It is what it is at this point. My dyno conditions were 70 degrees outside. I'll just assume something was not optimal for the dyno and believe that. I'll still enjoy driving and hearing my car! Thanks for the compliments.
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      01-13-2013, 09:03 PM   #9
F12M6MD
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Quote:
Originally Posted by whiteonredm6 View Post
I have no idea...can you tell me where you connected YOUR wireless controller power to?
I'll pass it along to my installer.
Thanks.
Without going into my trunk, I do remember the symbol for the particular fuse was a double rectangle (may be the head-up display fuse) but I do not remember the corresponding #. It was one that was higher up on the fuse grid and not staring you in the face. We tested to make sure power went here only when accessory power was on or car started. We used a "fuse buddy" to hardwire here. Maybe this vague explanation will help you. Lol.
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      01-30-2013, 10:59 PM   #10
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sounds great!
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