These quality extractors are made by Maniflow in the UK. These are the simplest to fit and basically replace Cooper or Cooper S standard extractors.
They are commonly fitted to 998, 1100 and 1275 when reusing the original carby on a "cut off" manifold or better still a water heated manifold.
Outlet pipe is 1-3/4" and finishes under drivers foot area, ready for the rest of the system. They will also fit with a weber or twin SU. Will flow up to 100hp, and retain good torque. Also the best choice to fit cars with rubber universals.
These extractors are probably my favourite quality basic extractor, fit well, sound good and don't leak! A quality component at a good price. These will probably be the easiest to fit to a Morris 1100.
(The freight may be slightly more than computer calculates).