Jez, do you use mild because you don't want to wrap stainless? Another misconception imo. Stainless won't go brittle and crack under heatwrap from what I have seen, mind you I don't wrap stainless manifolds if I can help it. Eventually any system will crack given enough heat cycles and vibration I just try to minimise it as I don't want my customers ever coming back.
Even painted the mild will rust away in no time under wrap. I guess if you only plan to use the car for a few years... That's the difference, I want my systems to last forever.
The tubes weigh around the same, not sure where you were going with that mate. While I still appreciate a nice mild system I know the exhaust acids will turn it to oxide within 5 years unless you ceramic coat it inside and out, which negates the cost savings and adds weight. I wish Ti and Inconel were cheaper but the only cost effective answer is 304 for the front and perhaps alloy for the rear sections if you were keen on weight savings.
Looks the goods mate, What turbo is that setup for? Kyle obviously doesn't fit these manifolds or he wouldn't have placed the wastegate directly under the turbo, making it nearly impossible to get to. If only the pipes were a little longer...