Question about header outlet size and system diameter

[cali yaris]

"something goes wrong" meaning it cracks or breaks. If that happens and you hear the exhaust leak that's fine, if you don't, further damage could result. It's not going to blow up your motor, if that's what you're asking.

As a customer, I buy proven high quality backed by good customer service. I don't want to have to deal with problems later, so I spend more up front. But that's me.