These manifolds have water running thru them to cool them so as there is a reduced risk of fire ect. The manifold you may be thinking of is called a log manifold. Doesnt do much for scavaging affect from the enginge but they still do the job of removing the exhaust gass to the rear. This is the style of manifold im using, due to the small amount of room I have. Yeah I too recon a set of rams horn manifolds or a set of block hugger pipes might work. Custom manifolds will be expensive.
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