Originally posted by markp27
I know some guys fill the exhaust with water, blocking one end, and then place it in the freezer - the expanding nature of water when it freezes pushes out the "dents". But keep a careful eye on the pipe in the freezer - don't just leave it there or else it may split.
Cheers, Mark.
PS: I've never tried this, but others guy here have.
Thanks for this advice
Will try this today
But how can I block the water 100%?
I think the Ice pressure will push the blocade out!
Cheers, Ognjen