ok so the guy at advance auto parts is telling me i will see a big difference in power AND gas mileage if i put a K&N filter in my stock air box on my 2008 ram 1500 4.7 auto 2wd ??? any ideas? its going to be around 56.00 for the filter and i dont like peeing money out the window for nothing... thanks

 

Don't waste your money. I've had k&n's on all sorts of cars in the past. Zero difference in mileage. Its not even a 'better' filter. They have to allow more air thru it to claim anything for an increase in power or mileage so the mesh is larger and allows more potential contaminants thru.

 

The guy is full of donkey dust...

It will breath a tad better and as long as cleaned properly oiled at the recommended intervals it will filter as good as a stock paper filter. With no other mods to utilize the slightly better airflow you won't notice a thing, a dyno will show maybe a 2-3 HP increase at the rear wheels, but if your butt dyno registers an increase, I'd say you have hemorrhoids. MPG difference - nope. If anything you'll lose fuel economy. More air in means more fuel is mixed with it. But don't let that stop you from buying - we are probably talking in hundreths of a mile per gallon here.

The advantage to using a premium, oiled, drop-in is that the fibers and oil used maintains flow and filtration for a much longer period of time. A stock, paper filter actually starts to clog within just a few thousand miles and it's performance gradually degrades from there. The K&N will flow and filter just about as well at 15,000 or even 20,000 miles as it did when you stuck it in. Plus, you won't ever have to buy another if you use the $10 recharge kit every 15-20k miles (and I can get three cleanings/oilings out of one kit on a drop-in, two on a cone CAI filter).

Worth buying, IMO yes. But I don't think you will be able to feel a difference unless you are replacing a clogged paper filter with the new K&N...

 

I put one in my v6 about six months ago. I saw a .5 MPG increase. Like Hammer said the best thing about the K & N is if you take care of it it'll be the last one you buy. Also look online for coupons and you can get it cheaper than $56.00.

 

The one in my Mustang has over 167K miles on it. Cleaned about 3 times. The one in my Ram has over 50K on it. Not needing cleaned yet. They last forever and filter just fine. I use them for the extra flow over paper and i will never have to buy another filter.

 

I put one in mine based on the same promises but any returns were negligible at best. I like having it though. Just clean and oil it nos and then and never replace it. Plus they give you a cool window sticker with it. Lol

I just put one in the used 4runner i just bought too.

 

Bought the pvc 3'' fittings from HOMEDEPOT 3""x10"" SPECTRE filters are half the price of K&N and 10 year warranty 3'' rubber coupler fits perfect around thotle body gainned 1 mpg ciy and 3 mpg hwy now at 15city &
21 hwy with stock exhaust and 3.92 rear end you be the judge 2007 trx4 HEMI
P.S very quiet at idle but when you put it to the floor the sound from the intake is incredible!
MIKE

 

Looks nice. I'd be interested to see what it would do on a dyno though. It's gotta be picking up hot air from off the engine which is probably why you are seeing a nice MPG gain. Cold Air in = more power, lower fuel economy (more dense, PCM mixes more fuel with it). Hot Air in = less power, better fuel economy (less dense air, less fuel mixed)...

I'm fixing to re-route mine up into my hood scoop (once I cut a hole in the hood) basically to free up the passenger side for my 2nd battery, but I'm hoping the outside air entering the scoop will boost performance a tad as well...

 

That looks like a HAI (hot air intake) catching all of the hot air that the fan pulls in thru the radiator. That is why all of the OEM's route the intake away from the engine.
I'm curious to see your modified intake set-up when you get around to it, Hammer.

 

Hammer has a health issue right now and I'm not comfortable trying to remove and re-install the hood by myself. Next trip up to the farm in February I'll have help (and the proper tools that are in the barn) to get the hood off to cut the hole. From there it'll be just a matter of re-routing the filter from the side to straight up into the scoop and little "make pretty" things like putting rubber molding around the hole so it looks factory when the hood is raised.
I was planning on doing it in late October/early November when I was up there, but I had just put a new lift on the Jeep (removing the spacers and going with longer, HD coils) and it needed a "maiden voyage" to test the new suspension out.

I've already got a second battery setup and on an isolator, but it temporarily lives under my toolbox,laying on it's side (it's a yaller top, you can lay them down) running on the re-routed power cables I ran to the back bumper for a secondary winch setup point...