Im using the QTP version and i believe picture up above the other guy is using the DMH. I hear the DMH are supposed to better one to use as they dont burn out as fast but i havent had issues with mine and i got it used.

 

Here's a video i made today or my car with long tubes, catted y, borla catback, and qtp e-cutout in the right tail pipe slot. Video isnt the greatest for sound and loudness for with and without the cutout open but you get the idea. Its very tame when closed and then when open its really loud! Its a night a night and day difference and to tell you the truth this is a must buy for and Borla owner to have the adjustability of tweaking the loudness of your car by the flick of a switch! Video shows starting with open for 2 revs then closed for a 2 revs then open again.

http://www.youtube.com/watch?v=ljhcU8bCFKM