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For most motors, the K&N isn't needed/beneficial. If you start modifying stuff, it will start being beneficial.
Now, this comes from a guy that measured everything by HP in his turbocharged mustang used for drag racing. A K&N flat replacement... well... it was turbocharged, so less restriction the better. I got a HUGE one.
Honestly, I"ve been toying around with building a stock filter type of box that takes 2 filters instead of one, but then still use the paper filters. I don't know if this would actually be less restrictive, or just allow for more flow.
On another note, you can actually design a mathematically correct intake tube for a certain rpm/displacement/HP. There are calculators out there for that!
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