Running a H Pipe,whats the advantage

Hi everyone, can you tell me the advantage on running a H pipe on the exhaust system? A friend of my got a h pipe installed on his big block monte carlo, and he says he can notice the difference. I have a 74 dart sport with a 318 iam running the eddy 600 carb, eddy performance #2176 manifold with stock heads and a comp cam 477/480. I also run hedders with a 2 and 1 half inch exhaust with dynomax mufflers. If i got the muffler shop to install the h pipe would i gain any horsepower? or would it be a waste of time and $$$$$$$$$$$ this is a street car. Whats the reason for the h pipe, to even out the exhaust? any advice is greatful THANKS
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