Just wondering why the 04 downpipes could not be used on a 99 bike?
I know the flage that bolts on the engine is 4 bolts and the 99 is only 3 but the upper part of the headers come off.

Looking at the pitures of the headers you have three parts. 2x pipes coming from the engine and 1x connection.
Was wondering if I could use my pipes from the egine and join then the 2-2 pipes underneith?

maybe different size pipes?