Originally posted by Harley#356

the QTP is a really high quality cutout, i was supriseed how beefy the butterfly thing is. doesnt leak at all when closed

As far as leaking goes, it is impossible on this type of application that varies so much to get a perfect metal to metal seal. That is why you hear of people having leaks on the various brands. If we could machine the parts to a constant given environment, then we could account for the thermal growth of the parts at a given temperature and the flatness of the flange and make it perfect. Unfortunately, given the variety of exhaust applications we are used in, our temperatures can vary from 200 degrees F up to 1200 degrees F.

So, about a year and a half ago or so, we worked with Permatex to use their high temp, copper impregnated RTV sealer to form a gasket on the valve. What we do is to open the valve, lay a bead of the product on the jam, and then close the valve so it forms a tight gasket. This product holds up very well, and every year or so, you can renew it with a tube of it from your local automotive store for about $4. This was the best solution that we have had and we haven't had any complaints about leaking since we started this practice. We also don't have screw holes in the middle of the plate since we weld ours on unlike our competition. One less area to worry about leaking.

Our dual setups are made with a single switch controlling both units. Our LED is setup on duals in an AND configuration, so both plates must reach the same destination before the LED will illuminate. It is next to impossible to guarantee that the plates are perfectly synchonized because they are open loop DC gear motors, and something as simple as overtorquing one plate onto the cutout can slow it down my 10% or so. But, the units will shut themselves down when they hit the positive stops, so you don't have to worry about over driving one side or the other. Basically, they will sync themselves up at the ends.

Most of the latest generation of Lightnings run the 2-1/2" duals unless they modify their exhaust or have a different exhaust system. That seems to be the best size for their results. I had a picture of one guy who basically instead of dumping right after the cutout, he rerouted the pipe beyond the muffler and merged back into the exhaust. That way, his truck stayed clean underneath, and the sound came out the normal exhaust pipe for a sleek, less resonant application.

Keith McCord
McCord Consulting Group, Ltd
www.mccordcg.com
St. Louis, MO
(314) 830-9471

Thomas
You might hear alot but not the right info. They seal up very well. If you
have questions for us please call and they will be answered.
Sales Team
www.QuickTimePerformance.com
201-995-9933