I've been too scared to hit the limiter as yet because I was told that the rapid decceleration of the engine forces the charger to suddenly slow, causing it harm.
Its ace!
Am I damaging it though? and can i make it any louder, it's like a really subtle but good sounding dump valve.
Can't stop grinning when I do it!
(made me only get 250 miles to a tank 
) It's standard apart from induction kit and s/s backbox.