I'm planning on running a set of 2.25" Magnum manifolds on my 360 in my 75' D100 short bed. My question is, what kind of power will these support before you're basically restricting the motor. I want to run 2.5" dual exhaust with "X" pipe all the way to the back with good free flowing mufflers. I just don't want to deal with headers so this is the route I want to go and want to build my motor to suite. I was hoping a mild stroker would be okay. Anyone have any real world experience or success with Magnum manifolds?