I think it's a great concept. It's something unique to the market and something that hasn't been done before. I think they've created a niche people are going to understand.
It can enter the passenger compartment from underneath the hood itself. It can creep from under the vehicle especially if you're idling for a period of time.
To make sure you don't have any restrictions in your tail pipe.
You shouldn't mess around with exhaust systems. You should just get it repaired. It's important.