the difference?

Caravanshaka

Your source's logic doesn't make any sense. Intakes are designed to pull in colder, denser air to increase the efficiency of the burn in the combustion chamber, along with higher flow, and in our case messing a little bit with the mass air flow sensor positioning and tubing to lean out our air fuel ratio a tad.

Adding in other bolt ons generally increase flow on the ass end of the engine, which only makes the longtubes a BETTER choice since you will relieve all of the bottlenecks in the system. If you just did drop-ins and a full exhaust, your engine choke point will likely be at the intake since it won't flow as much air as it could, restricting horsepower.

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The first testicular guard, the "Cup," was used in Hockey in 1874 and the first helmet was used in 1974. That means it only took 100 years for men to realize that in order to work the penis, the brain must remain whole.