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I'm trying to fit early downpipes (with the recess) to a late engine (from an x1) that originally had the non-recessed down pipes. I've bought new castleated nuts and gaskets and have a assortment of collets. There are 2 type of collet, long and short. I'm pretty certain that the longer collets go with the readier downpipes but I can't bet the pipes to locate securely when I tighten the castleated nuts. We fully tightened there is still a lot of play. I'm assuming I fitting the collets the correct way round with the wide end facing the cylinder head.

Any help gratefully received!

Thanks

Bob

OK, I've sorted it, although won't be completely sure until the engine is running. I used the larger collets / split rings and cleaned the threads and gave it another go. I was surprised just how tight the castle nuts need to be, no wonder they get chewed up.