Im looking to replace the air filter on my 98' deville to more of a performance one to try and get a little more Hp and MPG. I've looked into K&N and i dont believe they make one. I also just recently purchased a Green Air Filter (dont know if you guys have heard of it but it's supposed to be on or above the K&N level) and they said it was for a 98 Deville but it doesnt fit like the stock filter. Any suggestions on what to do/which brand to buy? thanks fellas...

Here we go. :want: :hide: :gun2: :brutal: :duck:

It won't help you.

I know it wont be a major change in either but a little bit wont hurt ya know?! plus I need a new one anyways so why not upgrade?

Here is where I got my Cold-Air K&N Air Filter Kit for my 1996 Sedan Deville; it's a decent quality kit, but it was a real, real tight fit if you leave the black fuse panel cover on under the hood; I will see if I can take a pic when I get a second.......

http://stores.ebay.com/ChromeIntakes-store

I know it wont be a major change in either but a little bit wont hurt ya know?! plus I need a new one anyways so why not upgrade?
Because it is not an upgrade. Do a search on K & N.

Because it is not an upgrade. Do a search on K & N.

You don't think a K&N or Green Air Filter is an upgrade from the stock paper filter? Both are made to increase airflow to the engine and are composed of better materials....

No, the stock air filter will flow all the air that the Northstar can take. Increasing flow also means decreasing filtering capacity. Do you think that in testing this high performance motor the engineers would have put a restrictive air filter in place? Unless you are looking for an increase in induction noise, K & N is a waste of money. Use the search feature and do a search for K & N. This subject has been beat to death.

Yea I'm gonna have to disagree with you again on this one. I don't mean to be argumentative but a K&N filter (or one on its level) will certainly outflow the stock filter. The stock one is made of cheap paper-like material while the others have an oiled cotton gause. This difference alone results in an increased/cleaner air flow which is beneficial to any engine. And I dont think the engineers did this on purpose at all, theres just something better out there than what they put in. Look at a super charger and what it does for example. It forces more air into an engine to increase airflow to the engine as well as horespower/torque. Same goes for upgraded exhaust. You have bigger exhaust pipes and higher flowing mufflers than your stock ones which allows for the release of more air. This idea goes with an upgraded filter as well. It's all about a more efficient airflow. I'm sure the Northstar is more than capable of producing a little more horsepower than whats specified on your window sticker.

If you put in a larger exhaust, then A K&N may help some, but it will not be "cleaner air". To be less restrictive, it passes larger particulate. Like I said, do a search. This has all been discussed in detail, including links to tests that show how much particulate each filter passes and what gains or lack of, there are. It's your money and your motor. You asked a question and I'm just passing on what I have learned and trying to save you some money. I'm not saying that using a K&N will destroy your motor. I'm just telling you it won't help any and will not filter as well.

Despite Ranger advising against it, I went ahead and purchased a Green Air Filter (part #2043). I installed it today and I can definitly feel a noticable difference in acceleration and throttle response. I haven't had a chance to see if my gas mileage has imporved but I'll keep you guys posted....

What you are "feeling" is the placebo effect. It is louder and you spent more money on it than a regular filter. You want to feel an improvement and you will. Trust me, you are not getting any better performance. The seat of the pants dyno is not that accurate. It's your money, if you are happy with it, that is all that really counts.

Please don't give me a psychology lecture. I'm not looking to "feel" anything. If you were right, I would let you know that I was wrong but I know what I felt. I'm not saying that I got an extra 50 horsepower out of it by any means. But after installing the new filter, it honestly feels a lot better and much smoother. I don't know what else you want me to say, we obviously have two different view points on this subject and if anything changes in these next few weeks, I'll let you know...

I think our old guru once said that IF the filter could make any improvements it could only be 5 HP at best and you could never feel that. It would take a dyno to prove it. Have it dyno'd with the old filter and the new filter and see what kind of results you get. That is the only way to prove if there is any improvement. I would have to bet against any.

haha what should be done is, have someone spontaniously switch yuor filters without you knowing....and see if you find a noticeable "decrease" is performance...haha

hahaha that'd be interesting...as far as numbers go thus far, i'm currently getting 17.1 mpg in stop and go traffic. I average about 10-15 miles a day to work and back and what not. This isn't a huge difference but it sure beats my previous 15.0 (+/- .5) mpg that I got with my old filter. I'll let you know if this number changes at all in the near future and after my next road trip I'll post my highway mpg.

Yo Tombo you're from L-town? I'm from Merrick and I actually life guard in the summer over at Slate and Acorn Ln. Small world...

hahaha that'd be interesting...as far as numbers go thus far, i'm currently getting 17.1 mpg in stop and go traffic. I average about 10-15 miles a day to work and back and what not. This isn't a huge difference but it sure beats my previous 15.0 (+/- .5) mpg that I got with my old filter. I'll let you know if this number changes at all in the near future and after my next road trip I'll post my highway mpg.

Yo Tombo you're from L-town? I'm from Merrick and I actually life guard in the summer over at Slate and Acorn Ln. Small world...

Problem with MPGs is that they vary depending on how many stops you make, how much highway, how much city, whether you get a red light or a yellow one, how many drive throughs and how long the order takes while you idle, etc.

So u get the point that it's impossible to determine the number with validity.

here's an infomative post on http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/68040-k-n-intake-i-want-one.html

Between the MAF and the MAP sensors the PCM knows exactly how much air is going into the engine and puts the correct amount of fuel--so theoretically there is no improvement in MPGs.

Hmmm, I bet he does feel a big improvment.......most likely because his old filter was FILTHY and for cheaper could of put in an OEM one and felt the same improvement.

Problem with MPGs is that they vary depending on how many stops you make, how much highway, how much city, whether you get a red light or a yellow one, how many drive throughs and how long the order takes while you idle, etc.

So u get the point that it's impossible to determine the number with validity.

here's an infomative post on http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/68040-k-n-intake-i-want-one.html

Between the MAF and the MAP sensors the PCM knows exactly how much air is going into the engine and puts the correct amount of fuel--so theoretically there is no improvement in MPGs.

I can definitly see where you're coming from. I took a look at that previous thread and there were definitly some good points throughout it. I guess it really comes down to preference and if you're willing to trust a company enough to spend 40 dollars on their air filter. I like the fact that my Green Air Filter is re-usable and at the moment I'm seeing some results with my everyday driving so I'm glad I purchased it. Things could change in the long run and if so, I'll eat my words and will have learned a 40 dollar lesson. You can look at the information that says these filters are a waste of money and let more dirt into your engine and what not or you can look at the positive results that they've had in tests where they have higher airflow/filtration rates. You just can't be bias about it. In some cases an AC Delco filter could be better for your car/truck (like in the DuraMax Diesel case study) and in others a Green Air filter may out perform a stock one. Chances are none of us will never know unless our specific applications are thuroughly and again specifically tested by someone. Until then this issue is going to remain up in the air...