GTHAUS is pretty amazing. My friends have the E370 + ART. MXP with Fast INT RHFC and I have owned several other exhausts like HKS HI-Power, Fast INT ( 4 different setups) Full Tanabe catback (y-pipe/mid/mufflers and GTHAUS is my all time favorite. E370 looks and sounds great but my vote goes to GTHAUS 100%.
2013 G37 Sport Coupe 6MT. Stock cats
Here is my setup
GTHAUS - Y-Pipe/Mid-Pipe/Muffler
https://www.facebook.com/photo.php?v=4732878569125
https://www.facebook.com/video/video...=4732876649077