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Message: <blockquote data-quote="xsoutherngun89x" data-source="post: 224690" data-attributes="member: 10002">see thats where companies get you nowdays. lol. they know the plenum and TBwont add much HP, but the tell u it will. the plenum/throttle body combodoesnt do much for a stock motor, however it will increase throttle responce a great deal from what ive heard. but its not really gonna gain u anythinguntill u have some type of forced induction, even then to see the potential gainsu need to be able to get all that air out, this is where the headers and exhaust come into play. it all works together because the easier the engine breathes, thebetter HP its going to make. think of engines as an air pump, the more efficient u make the motor at breathing in and out, the more it will reward u with HP gains.the whole reason our 4.6's love forced induction is because we dont have the neccecary cubic inches to draw in the air by engine alone. our combustion chambersare limited and after so many mods, wont bring in any more air. unlike a big block which can breathe in much more air because of its diplacement. alot of people dontknow that the engine draws air in by the piston going down before the compression stroke. forced induction just helps that process out by shoving air in, letting the enginework easier since it doesnt have to do all the work. wow, didnt mean to go into a lecture, lmao :hammer:</blockquote>