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UEL exhaust headers will raise torque due to some of the cylinders keeping higher backpressure than others...the top end will be lost due to the same reason...Much like chosing a long runner intake manifold vs short runner...
As for making the SAME horsepower but more torque...it would depend on what the constants are there.
Do you mean the same horsepower as "brand X manifold" or the same horsepower as you would make using a dynamically identical manifold just one made using a UEL method...
If the choice is ONE..then yes of course, you can produce more HP and more torque than a particular brands item by having one produced to suit YOUR car your climate and the rest of the modifications done to your car...
If the choice is #2..then no, because the majority of the design will carry over thus keeping the limitations/gains similar in all area's EXCEPT UEL....
The real question is, when will a company produce some variable length headers (i remember seeing a design/patent offer for this a while ago but it was completely unpractical..probably tripling the weight of a standard cast type)
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