If your ears are sensitive, bring plugs. To me there is no finer sound than a TR6 revving up to red line. After spending most of my life listening to engines being run to high rpms, it would be almost sacrilegious to block any of that sweet music.
Besides, I've been trained to listen for that detonation sound, tappet noise or rod knock that can spell an early death for an engine. I want to hear mine go all the way up and down.
Now with all that being said, I will back down a bit and admit that a TR8 is one wicked engine to listen to when revving up as well.
Just be ready to enjoy. take an assistant that is good with the camera, as you will probably be running your car on the dyno.