exhaust cut-out question???

I made my own by running a 21/2 pipe straight out the exhaust to under the doors and using a collector on the end with a stainless steel plate to cover it. all I do is remove three 9/16 nuts and it all open. I am often asked what are those things under your doors and I am fast to show them. sounds good and is easy to do. I fear things I have no control over malfunctions.