Just discovered that previous owner has replaced Center section of my blob PPP with a 2" bore. What makes matters worse is that whoever did it, cut off the flange to the box section and Center section and joined them with a clamp. 

 

I have managed to source a replacement prodrive Center section and back box. I'm getting new bolts and gaskets but question is is it worth wrapping the exhaust and if so which wrap would you guys recommend. Its a stock blobeye sti PPP. 

I don't think there is any point in heat wrapping the centre section... 

I was thinking of Center section and whatever pipe is showing after the flange. Would I see no benefit?

up pipe, down pipe, headers are worth doing, rest not really worth it due to limited gains

Cheers guys