K&N Intake? - DodgeIntrepid.Net Forums - Dodge Intrepid, Concorde, 300m and Eagle Vision chat
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post #1 of 43 (permalink) Old 11-08-2011, 10:31 PM Thread Starter
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K&N Intake?

I have a simple question this time...unlike some of my other posts. Will a K&N cold air intake actually improve my car's gas mileage and/or performance? I found one for my 2.7 and wanted to know if it would be worth the money. What are the benefits of this intake over the stock intake?

Also, would converting to true dual exhaust have a performance gain? If so, how much of a gain? Which is better, x flow, h flow, or two separate lines? A guesstimate or average price would be nice too

Thanks!
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post #2 of 43 (permalink) Old 11-08-2011, 10:46 PM
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The K&N adds a nice growl to the car. There's a slight improvement in performance, I found there was less of a hesitation when you punch it, MPG gains, they're minimal if not null.
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post #3 of 43 (permalink) Old 11-09-2011, 05:50 AM
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Will a K&N cold air intake actually improve my car's gas mileage and/or performance?
are you regularily going to rev to 6000+? otherwise no to both.
you can buy a lot of disposables that filter better for the money.
cafe standards being what they are, there is also negligable gains to be had by changing to different exhaust. it's personal preference that makes the choice, unless you are highly modifying the engine to need more flow.
if you want noise, spend money.
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post #4 of 43 (permalink) Old 11-09-2011, 06:40 AM
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Quote:
Originally Posted by mikey6400 View Post
I have a simple question this time...unlike some of my other posts. Will a K&N cold air intake actually improve my car's gas mileage and/or performance? I found one for my 2.7 and wanted to know if it would be worth the money. What are the benefits of this intake over the stock intake?

Also, would converting to true dual exhaust have a performance gain? If so, how much of a gain? Which is better, x flow, h flow, or two separate lines? A guesstimate or average price would be nice too

Thanks!
Quote:
Originally Posted by hrmwrm View Post
are you regularily going to rev to 6000+? otherwise no to both.
you can buy a lot of disposables that filter better for the money.
cafe standards being what they are, there is also negligable gains to be had by changing to different exhaust. it's personal preference that makes the choice, unless you are highly modifying the engine to need more flow.
if you want noise, spend money.

The gains on the K&N FIPK (as reported by K&N own's dyno testing) is about 8 whp.
I would think that is generous....maybe in the 3-5 range is something more acceptable.
If you are going to add the FIPK, you should also look at a upgraded throttle body, and upgraded exhaust. 2.7's breath better on the top end anyhoo, so more in, more out.


As far as the comment from the second person...might want to do a little research before they open their mouth, and insert foot.



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post #5 of 43 (permalink) Old 11-09-2011, 07:47 AM
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Here's a study that shows that for actually keeping dirt out of the engine is not necessarily as good as a good paper filter: http://home.roadrunner.com/~jbplock/ISO5011/SPICER.htm

Not saying don't use it or that it doesn't have advantages - just saying make an informed decision.

Last edited by peva; 11-09-2011 at 08:09 AM.
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post #6 of 43 (permalink) Old 11-09-2011, 08:13 AM
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personally i like my direct replacement mopar paper air filters
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post #7 of 43 (permalink) Old 11-09-2011, 10:59 AM
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I'm not a fan of wet filters for the reasons Peva points out.

The HP gain of any engine based on improved air filter flow can't be a static number. If the engine can't make use of more air there is no gain. In order to make use of more air the fuel needs to be increased and the flow through the heads needs to be increased. So adding the filter to the car will only increase power if there is excess capacity already.
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post #8 of 43 (permalink) Old 11-09-2011, 11:11 AM
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We're not just talking filters here, we're talking the whole intake! Keep that in mind.
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post #9 of 43 (permalink) Old 11-09-2011, 11:29 AM
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I have read that 'cold air intake kits' can help improve fuel efficiency, BUT they work best like a turbo at around the 3000rpm mark.

I have tested this, and with my intrepid (2.7l, K&N FIPK, Borla Muffler, no a/c, etc..) 3000rpm is roughly 160KM/H.

Now understand, at this RPM, I was averaging around 600kms to a tank, but that was strictly highway driving (obviously) on premium fuel and I don't think its that bad considering the speed. BUT Please keep in mind, Radar detectors ARE NOT illegal in Saskatchewan, but weigh the options as well, is it worth getting better mileage if it could land you in jail? or worse killed in an accident?

Just some food for thought.


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post #10 of 43 (permalink) Old 11-09-2011, 11:38 AM
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I understand its more than the filter, precisely its the tube leading to the intake. So the increase in potential volume ends there and is reduced to the throttle body/intake/head and valves. So its a funnel and at the end of that funnel is the restriction which will determine the gain.

My point is that the stats on a performance product are dependent on the application. In this case a pedestrian 2.7L.

edit....no offense to 2.7 owners, I have one and its a great little engine
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post #11 of 43 (permalink) Old 11-09-2011, 01:11 PM
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...My point is that the stats on a performance product are dependent on the application. In this case a pedestrian 2.7L.

edit....no offense to 2.7 owners, I have one and its a great little engine
I'm sure glad you added that last sentence there, Ken. For a second there i thought I was going to have to break out a can of 2.7 whoopass!! LOL!
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post #12 of 43 (permalink) Old 11-09-2011, 01:26 PM
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I'm sure glad you added that last sentence there, Ken. For a second there i thought I was going to have to break out a can of 2.7 whoopass!! LOL!
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post #13 of 43 (permalink) Old 11-09-2011, 07:19 PM
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Quote:
Originally Posted by mikey6400 View Post
I have a simple question this time...unlike some of my other posts. Will a K&N cold air intake actually improve my car's gas mileage and/or performance? I found one for my 2.7 and wanted to know if it would be worth the money. What are the benefits of this intake over the stock intake?

Also, would converting to true dual exhaust have a performance gain? If so, how much of a gain? Which is better, x flow, h flow, or two separate lines? A guesstimate or average price would be nice too

Thanks!
Running a 3.5L I had some gains in both HP/TQ and MPG but below 3K RPM, where most people run for everyday driving, there was almost no gain. The 2.7L already has an over-sized intake since it uses the same parts as a 3.5L, an engine almost 30% bigger with 30% more demand for air. If you're just looking for MPG I wouldn't bother changing the intake on a 2.7L.

I don't know about the exhaust. If the stock 2.7L exhaust is the same as the (non-HO) 3.5L then I wouldn't worry about it, either. You'll see very little gain for the money.
If it's not the same then you should have some minor gains by up-sizing but you'd only see a return on your investment IF you get most of the system from a junk yard and do most of the work yourself.

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Last edited by D76G12; 11-09-2011 at 07:28 PM.
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post #14 of 43 (permalink) Old 11-12-2011, 09:14 PM
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Quote:
Originally Posted by shadowvox6
As far as the comment from the second person...might want to do a little research before they open their mouth, and insert foot.
really? where is the horsepower made? in a useable rev band, or quarter mile all out top rev only? unless you are continually drag racing, you will not see benefits of 3 or 5 hp. you will see no benefit from a kn filter, or any "special" aftermarket filter. maybe go back and check your research for where that "power" is made. i don't rely on the manufacturers of products to provide accurate info. i do trust independent info more reliably.
care for a shoehorn to remove yours?
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post #15 of 43 (permalink) Old 11-12-2011, 09:28 PM
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Originally Posted by shadowvox6 View Post
As far as the comment from the second person...might want to do a little research before they open their mouth, and insert foot.
Quote:
Originally Posted by hrmwrm View Post
really? where is the horsepower made? in a useable rev band, or quarter mile all out top rev only? unless you are continually drag racing, you will not see benefits of 3 or 5 hp. you will see no benefit from a kn filter, or any "special" aftermarket filter. maybe go back and check your research for where that "power" is made. i don't rely on the manufacturers of products to provide accurate info. i do trust independent info more reliably.
care for a shoehorn to remove yours?
Anybody else find this funny to say to HIM? (regardless of who is right!)
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