n e body get an increase in performance with useing a K&N filter in the factory air cleaner housing??

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
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system: 2 10" MTX thunder 2000 in a Professionally done custom bandpass box.
Blaupunkt CD player
Blaupunkt 4x6 and 6x9
600 watt rockford fosgate 4.6 amp

thinking about a flowmaster

 

It does nothing.

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Eric Natzke
91 Firebird 305 TBI (ZZ4 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-Accel Cap & Rotor-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html

 

dont do it. if you want k&n get an open element. If you want factory, stay with paper.

 

i know the open element would be better i was only asking becouse alot of the tpi guys seem to get an increase out of just the k&n. I just wanted to know if the same applied to us

 

they have different air boxes, ours is round, theres are flat. I think their airbox is already free-er flowing. maybe.

 

A K&N in a stock air cleaner isn't going to make that much of a difference if any. I know from experience. I do know that when I was repainting my stock air cleaner I totally forgot that I didn't have an air cleaner when I went to go buy paint for it. So yes I drove without an air cleaner...bad move but I did it by accident (thatn's what happenes when you have to wake after 4 hours of sleep for a crummy summer job). Anyways, the car just spun the tires and that was when I relized I didn't have an air cleanner. Lucky for me nothing happened so I was in the clear, still dumb move on my part. After that I got the dual air cleaner and I noticed that the LO3 had a much better sounding intake. It was deep and pulled at higher rpms, not kidding. I would have to say that is was good for at least 10hp in the upper rpm range. If I could tell the difference then there must be one. Anyways, I would go with an open air element just because I noticed a huge difference without the air cleaner and that is the closest to :-) good luck, also you can still get the K&N and put it in an open air cleaner as long as it's a 14x3.

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, Jon (91 RS too many mods to list)