Ok, What type of stainless are the Borla and Magnaflow kits made from? Looks like the Magna kits are a little lower quality stainless as it turns that light red-brown shade of rust where the Borla kits dont. Flowmaster Came out with their 409s kits (I assume t409 Stainless). Is 409 a good stainless to polish like 04speepers? Will it hold the shine well? Im also afraid the mufflers are still mig welded thus the welds will still rust. (New flowmaster 409s that is)