I love the sound and the PRICE of the 42 dp and magniflow combo. But to my understanding it is not stainless steel. At least the 42 dp isnt. Wondering if the cat back is stainless steel? Is it suggested to get the ceramic coating? I do live in Las Vegas where it rarely rains so I'm not worried about rust. Any thoughts? Wonder how much the whole turbo back would cost to ceramic coat? Sorry for all the multiple ?'s.