GHL muffler questions...
 

anyone one out there with ghl muffler can you give me your opinions on the muffler... as in sound...resonnance, performance, and cost....thanks.

Resonance is pretty bad, the worst i've had in any car!
sounds great though.

don't the Fabspeed cat-bypass pipes help cut down on that?

Sound is great, sounds more like a Ferrari or Maserati
There are a few on board videos of me with my GHL on YouTube (look for ChrisZang), example http://www.youtube.com/watch?v=L9nsWLBFKrY
A nice side effect is that the rear trunk will be less hot as there is more air flowing around the muffler to cool it.
Resonance between 2k and 3k is loud, I mean LOUD, I always keep the revs over 3k
It's actually so LOUD that my wife is no longer willing to keep up with the volume in the car, so the GHL must go :( , send me a private message if you're interested

is there anything that can be done to keep the resonnance to a minimum? for example add a resonnator or something...

here are some pointers:
http://www.yellowboxster.com/news.html
I actually bought the exhaust wrap but never got around to wrap it around my exhaust, it's now sitting somewhere in my garage...