Exhaust out the boot (over the top) keeps heat away from the important bits, and helps keep the rear cool but there is no one up here good enough to do it. Meaning a trip south of the border and about £1600.
The heat also causes issues with the CV joints, too hot and grease sprays everywhere

. You get around this by adding a vent/pipe/spacer to the small end of the cv joint, so air can escape as it heats up. High temp grease works well, and use a little as you can get away with.
Alan