how to remove exhaust from astra g?

if it has a `u`type clamp then these are usually seized/tight to remove and may require a hack saw/grinder to remove,once off the exhaust flanges are usually seized also and usually need heat to free off but can also cut with a hacksaw the outer part of the flange and get the joint moving,very rarely exhausts fall apart as easily as you are suggesting

cdc
December 2010