You will still get more warping with the bonnet lift. It actually doesn't do much at all in reducing the overall temp of your bay.

You need to stop the heat from radiating first, and then insulate the key areas it hits on your bonnet, i.e, directly above the turbo.

Start with a turbo insulation kit http://www.rocketindustries.com.au/d...partno=TT15001, followed by a heat shield on your bonnet underside.

A product like this http://www.thermotec.com/product_detail.php?prd_id=25 will adhere to the bonnet and protect from radiant heat and also insulate.

Set this up properly and you will have no more problems with heat in your bay. Btw i don't endorse any of these products, just pointing you in the right direction.