I have electric cutouts and I love it... it kinda sticks down a little and is shiney under the car and allot of people ask me what it is.. but I'm sure I could probably tuck it up a little better.
That being said, I have a QTP and it's worked everytime I've fliped the switch. it's nice, cause you can go with quiet, loud, or insaine within 5 seconds without ever getting your hands dirty.
It's nice for 2 reasons...
1.) after the car has run a little while, FORGET about taking the cap off until it's cooled down if you do not have one
2.) I can't even begin to count how many times Law Enforcement Officers have busted u-turns to follow me and I flick the ol' switch and it gets all quiet... they then follow me for a few miles then turn off... (of course with collector plates, it won't matter anyway... I'll be exempt tongue.gif )
Besides that, It will allow me to "visually" pass E-checks if cops look under my car...