K&N drop in filters 33-2399
 

Does anyone have esperience with the K&N 33-2399 drop in filters? I have used K&N filters in every motorcycle and car I have owned and just purchased a new 370Z Touring with Sport Package. Also have a Invidia Gemini catback on order, but don't really want to mess too much with the engine management, so I have decided not to go with K&N cold air intake system.

Any input on either of these, either with or without a catback system would be appreciated.

Why the thumbs down? Plenty of people here have used the k&n filters with no problems. Also you mention the k&n cold air system and not wanting to get a tune; you don't have to. Again there are plenty of people here running k&n intakes as well as other brands without a tune and doing fine. Did you do a search for both k&n products to even read the reviews people gave them? Lots of info out there

Do a search for Jordo!'s thread on the proven gains of K&N drop in filters across the rev range. Good stuff!

Sorry, I put in the wrong icon. Signs of aging that it looked like a question mark. I am a major fan of K&N and have had them in all of my vehicles.

How does the cold air intake setup affect the engine tuning?

DonV, I am very impressed with the stock intake on the Z. The filters seems to be restrictive, and K&N (or another brand of more free flowing filter) seemed to be the way to go. Combined with a cat back exhaust, K&N's add a breath of fresh air (sorry for the pun. Had to do it. Had to.).

The Stillen G3 makes good power in the upper range, but is 3X's the cost of K&N's and required removal of the front facia and cutting of the front cross member, ruling it out for me. The sound is great, however. More pronounced at WOT than the K&Ns (which does yield some good sound nonetheless).

Definitely search here. You'll find some great data about the K&N's, both in terms of gains and the ability of the stock boxes to keep air temps close to ambient.

What about the K&N cold air intakes.....I dont like the idea of having to take the front end of the car off every time I want to clean my air filters.....I do understand the K&Ns do not get as much cool air as the Stillens.....but I am willing to sacrafice that....

to sum it up in 3 short paragraphs:

if you want power and the large sound change, get a long tube intake. if you want just the sound change, get a short ram intake. No intake that is a short ram can be a cold air intake because it sucks in hot air from the engine compartment, where as long tube intake are cold air intakes because the filter is relocated to an area outside the engine compartment where it can suck in air cooler than the ambient air temp inside the engine bay.

With that said, the oem intakes are very well designed. Coupled with the K&N filters, the sound is very nice, yet very subtle, and the performance has been notably better than short ram intakes, with long tube intakes making more power above about 7k rpms.

If you want that extra power, your only choice is to get the long tubes. If sound is all you care about changing, go for the short ram, but dont expect any legitimate power gains. For those who are looking for a mod, just for the sake of modding, without sacrificing any extra cash or performance, the K&N drop ins are the way to go.

I looked very closely at all of the available intakes and decided to go with the K&N drop ins and HPS post MAF pipes. I think it gives me the best of both worlds. Like has been stated, long tubes seem to give more power at high rpm's and short tubes have the problem of picking up excessive under hood heat. I have installed the Stillen CBE and combined with the intake that I described above my "butt" dyno tells me that I am producing more horsepower. It may be the placebo effect, but I know that others here have seen real gains with similar setups. I know that my Z certainly sounds better.

I have a feeling that the gains that I would pick up from installing a long tube intake at this point would not be worth the expense. I intend to get some HFC's at some point and from what I read here that will give me more bang for the buck. Unless you are going for a better looking intake, which is a valid reason to add an aftermarket unit, I would just add the drop in's and see if you are satisfied with that.

AZ

:iagree:

I am also going this route. k&n drop ins with HPS post MAF tubes. I have ERZ HFCs and a JIC Magic Y pipe, the sound increase is noticeable Intake and Exhaust, and my butt dyno feels that the car has more power. Will be going to dyno soon hopefully ill have around 300 whp.:ughdance: