Originally Posted by K15 Blazer Guy
I worked at K&N at one time... you DO get more HP. even if its a high millage beat to hell engine, it will gain HP.
but you will loose economy 90% of the time
particularly if it goes on a OBD2 controlled motor. with all the extra sensors involved, more air = more fuel in the engine.
making the engine turn easier is the key to HP and economy, yes. but, with newer motors it is very difficult to fool the paired engineering and computer programming to get you better