| Allen, I am just in the process of completing a rebuild of my BN 2 to M 
specs.  I stayed with the stock exhaust manifold with a little clean up, 
polishing, 
etc., and then installed the heat shield that DW sells.  It is substantially 
bigger than the stock one.  That along with the cold air box & 100M hood vents 
I believe will keep things under control.  There are others that don't even 
run a heat shield or the spacers blocks and they have reported no problems.
Cheers,
Gary Fuqua
Branson, Missouri
BN 2 (M spec)
Check out the new British Cars Forum:
http://www.team.net/the-local/tiki-view_forum.php?forumId=8
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