The air pump is definitely history, and the Mini Ram doesn't use an EGR so that's out too. :gap
There is nothing wrong with the PCV valve; the engine has to ventilate and it can benefit from the slight amount of oil sent back through the intake side. And as long as your rocker covers are baffled to prevent an excessive amount of oil being splashed back through the PCV you're alright.
That leaves the catalytic converter. Again, as I've stated already, there is nothing wrong with what is offered on todays aftermarket shelves as "high-flow" converters. As for hampering flow, there is little if any restriction when used in a closed system. Open headers of course offer the least restiction to flow. :L
Hell, they even have mufflers now, such as some offered by Flowmaster, that increase torque yet at the same time maintain sufficient noise reduction that they can be used at small tracks where there is a limit to the level of sound allowed, such as "Run what ya brung" nights.
As for the final horsepower figures. If we use the "rule of thumb" that says 15-18 percent will be lost to the drivetrain, I should still come out with around 435-440 horses and 450-460
(lbs/ft? - ft/lbs? ROTFLMAO) of torque at the rear wheels. :J
_ken
