Does your water temp move at all on track?

[shimmy]

Originally Posted by AlexGTT

Any unexpected high temps on track at WOT always points to HG failure between cylinders if said temps then fall quickly when slowing. Most HG failures blow into coolant or oil system which is easy to diagnose. E46 M nearly always between cylinders. Less easy to spot and can remain minor until complete fire ring failure shows itself with a noteable miss-fire.

Any problems like this an I'd have a cylinder leak down test, NOT compression test.

Alex, why does cylinder to cylinder leak cause higher temps at full throttle then?