View Full Version : Drop in filter

12-21-2001, 07:48 PM
Going to install a K&N drop in filter into a 95 240SX. Will there be any significant power increase? Also, is this something simple to do? I'm not mechanically inclined, but trying to be.

12-21-2001, 08:06 PM
Nope, not really.. I had one on my last s13.. didnt notice it. BUT if you concentrate hard enough, I'm sure you could "imagine" the power increase! =) A full intake system would be better

Its easy as pie to do, just like replacing the air filter. Pop off all of the snaps holding the top on the airbox, and viola!

-alkatraz http://www.northwestnissans.com

12-21-2001, 09:56 PM
A K&N will (theoretically) have a much higher clean flow rate vs a normal filter.

It will also (theoretically) have a higher dirty flow rate than a clean normal filter (slightly .. or was it slightly worse? still impressive).

The best thing about them is that you don't have to replace/clean them for 10000's of miles, they'll pay off in that way at least in the long run..

Plus the K&N sticker you can then use adds 50hp http://www.freshalloy.com/

12-21-2001, 10:12 PM
Its not my ride, its my gf's. Everytime I drive it, everyone wants to race and its a 50/50 chance that I'll win. She wants to get a CAI, but had to many things to fix before getting to that. Window regulator, two new tires and an oil pan for starters. So in the meantime, I thought it would be cool to put a drop in filter to help things out a bit. http://www.freshalloy.com/

12-21-2001, 11:19 PM
You might free up an extra 2-3 hp at the most.

12-22-2001, 06:16 AM
Maybe I'm just imagining that, but I think I've noticed a "roaring" sound since the k&n between, uhm, 3-5k RPM I believe.

Very easy to install, btw.

[ 12-22-2001: Message edited by: Neurotoxic ]

12-22-2001, 04:45 PM
No your not imagining it mine makes that sound, but when I put in my exhaust I couldn't hear it anymore, cause my exhaust is kinda loud.

12-23-2001, 07:01 AM
I found that removing the "y-pipe" intake tube will give you the same sound, only louder and longer. (and it doesnt cost $30)

12-23-2001, 08:14 AM
Removing the y-pipe (that's the CAI, right??) is the first thing I did. If there was any louder sound, I don't remember it. But I know that the K&N made a difference. Now, I'd realy like to know if my Injen will make any louder sound. I'm just too lazy to install it http://www.freshalloy.com/

12-23-2001, 08:55 AM
The Y pipe is what extends from the air filter box, and splits to behind the left headlight, and down into the resonator box..

I removed mine, its my only power 'upgrade' so far.. Not only does it DEFINATELY breath better at high speed / RPM (making 5th gear actually usable for passing, instead of crawling), it sounds hella meaner.

I plan to get a lower half of a stock airbox to hack up, so I can have the huge filter but ahve a huge opening.. don't wan't to wreck my stock one in case I need it.

Oh, and the pipe that goes to the ... forgot what it was, the valve thing that lets intake air into the exhaust stream for emissions purposes, the fitting on it's secondary resonator box has been broken for sometime, and now it doesn't even line up w/the pipe, so I took it out and plugged the hole in the airbox with a 9/16 or so washer (slightly larger than the hole on the airbox, whatever it was), with a bolt through it so there isn't a huge gap in the middle that might cause the tape to implodes) then taped over the bolt/washer w/ electrical tape, then wrapped around the whole spout w/ the tape and around the tape that was X'd over the end where the washer was..

so now I don't have to worry about sucking unfiltered air into the engine.

I need to get a mini filter and clean out the AIV or whatever it is and attatch that to it.