What exhaust manifolds do people use for a locost (Ron champion) 7 when running a ford xflow engine?

Not wanting to use the standard item as the engine is now a reasonable spec.


Any comments / links would be much appreciated.

My old locost racing car has this type of 4 branch manifold, that goes over the top of the chassis, which I am told gives more top end power...

Tony Law are very popular amongst the 750 racers.

http://www.tonylawexhausts.co.uk/2410/frames.php