Hi Anthony, to separate is definitely a wiggle and tug to get the system apart and I leave the primaries firm to get a decent purchase on them. Refitting is much easier though when its all apart. i attach the primaries loosely to the head, apply exhaust paste or copper grease if a good fit and this helps massively with getting the collector and then silencer(s) into place. when its all fitted, I can then tighten the primaries and all the other joints as needs be and get it aligned properly. Not much effort at all to assemble on to the car.