Twin 45-s on 9a?

Depends which manifold you use, one may as well be thrown in the bin, the TWM [The weber man] is the one to have, its an american make, the other one is a really poor design apparently and aims fuel directly at the wall of the manifold...

 

the mangoletsi is the poo one, like an old mini swan neck weber manifold

 

Yeh they make terrible manifolds.