I plan on having it ceramic coated sometime in the next couple weeks.

I did some runs on the highway on my way home. I only pushed it to 16psi because my tires are really bad. I had to lower the boost controller 20% over my previous setting to get the same boost. I can tell I lost some midrange but the top end is totally different. There is way more power! The butt dyno tells me about 20 extra hp on the top end. I did one little pull in 3rd gear at 20psi from 3k rpm, when I got on it the damn tires broke loose so I backed off of that. I won't be able to tell if I can hold the boost pressure till I upgrade the tires. I am really excited, because it made a huge improvement.

For those of you keeping score at home, the exhaust starts at 3" ID at the downpipe then upsizes to 3.7" ID before going over the crossmember, 5" ID tip.