I'm not sure what brand my headers are, but I'm extremely happy with my Magnaflo 2.5 stainless exhaust behind my BB. Other then welding the reducers, it was a simple bolt up package that sounds great. It took me a couple hours on my back in the garage with a jack and stands.
I got mine from Gardner Exhaust, everything fit perfect and only took a couple hours to install. Probably as close to OEM as you will find, but they take a long time to ship as they build their kit after you place the order.
I built mine from 3" pipe, a universal "X" pipe, magnaflow mufflers and some Flowmaster 3" tail pipes, came out good, going to spray some high heat silver on the pipe, I live in FL and everythings rusts,