My magnet fitsfine,my car came with a new mongoose system which was a piece of shit,the old style is far far better made than the blueflame made/Collins supplied system.
My only 2 complaints with the magnet is I dislike rolled in backboxes and mine isn’t properly welded where the 2 pipes merge into 1 so soot gets sprayed onto the diff.
2 things I’ll be sorting before it goes back together.