Exhaust came in 4 days ago, but I've been busy with work...so no painting or installation yet. Going to try sanding the pipes tonight and cleanign them thoroughly prior to painting them with POR20. Once that is done, I'll let it dry for 2 days (humidty helps it cure along with heat, once installed) and install it Saturday morning. Install should be easy, but making sure proper paint coverage and adherance is the hard part. Ensuring the welds are coated good and have an excellent bond. Other than that, it's just slip together and clamp.
Oh, and the flange meeting the CAT end is about 5/8 of an inch thick! It's going to take A LOT to rust that through.
POR20 is good for around 1400 degrees, so definitely more than plenty for a post CAT system. Factory piping pre CAT is 2.3" and post CAT is 2.36". The 4.0L guys say to stick with 2.5" from the CAT on back to maintain a good exhaust flow. Gibson exhausts have low to moderate grumble, so this should be nice once installed tomorrow/Saturday.
I went the POR20 route because I didn't want to spend the extra 150-200$ on a stainless steel exhaust. The POR20 is corrosion and salt resistant, just like stainless steel, but only 30$ for a pint (and I still have about 90% of it left!).