Will the Corvair motor get to hot if I don't use the lower heater shrouds? The motor will be out in the open on a 3 wheel trike. Y I am asking is I want to use the ultimate exhaust from clarks. They say I can cut holes in the shrouds to install it. Will the cylinders get to hot with out the shrouds? Thantyou Jim in the AZ dessert lol.