It looks like a cheaper version, might be worth a go though.
This is the one i found:
http://www.outerwearsracing.com/prod...sp?prod=202641
looks more breathable, by the fact you can see through it!
Definitely need air flow over speedo and motor as they got very warm when i made an improvised underbody from a plastic bag and gaffa tape at the last round of our winter outdoor series!