Jim only wrapped his downpipe. He left his super long tube top mount manifold unwrapped and doesn't have any issues with things melting. So if you like the look of your manifold, don't wrap it.
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs