heatshield exhaust wrap

just a quick question before i commit to buying.

so im for taking the manifold off to weld in the de-cat so i thought while i have it off id wrap the manifold :smile:

was just going to order the wrap off K-Tec but wanted to know if any one on here had done it before or what size of wrap to go for.....

it all comes in 7.5m lenghts but you can get 25mm or 50mm widths so which should i go for which would be more suitable for wraping the manifold?