Hi Guys - I've been floating around the 1200 website for the past 6 months getting info on a12's - the site is excellent!

Anyway, I need some advice... I've got an a12 in an old English sports car (believe me the old BMC a-series was a nightmare for reliability) and it's specs are as follows...

a12 bottom end - standard except of flat-top pistons.
a14 head with a custom made single 40DCOE weber (only can fit one in there).

I want to go out and buy a set of extractors, what should I get, 4-2-1 or 4-1? And after that where should I go to get the rest of the exhaust made? I'm in the Sydney area...