There's one on my 172, was on it when I bought it.
Meant to be "stealth" by design - It isn't
Meant to be stainless - It's rusting
Meant to be made to fit my car - Since lowering the car, it sits on the rear beam
Meant to be welded - It looks like pigeon s**t
Meant to be a replacement - They've removed the big exhaust mount and cable tied it through the chassis to hold it up.
I s**t you not, they are terrible, and mine is coming off and going in the bin as soon as I can!!