@ben
yep manifold fitted a treat but... the guy who fitted it said that the joining pieces in the jetex kit were not a great fit so a bit of welding was needed.
the whole system is great but i have lost power, the car is still bonkers quick but has lost that snap throttle response,
the old manifold was actually ok the rattling was from the 2 inner runners touching each other, not sure why it has lost power but the old manifold seems more free flowing i.e it has a larger collector where the 4 runners meet.
next up is the charger rebuild, with possibly going to a g65 and an lsd, lsd is a must