My van on the other hand ventures into single digit MPGs. However, in a car that gets 25-35mpg, the driver might say "eh, 1/4 mile more mpg isn't worth my time and the cost for a K&N". At the same time, I know that the stock OEM type filters perform very well in filtration and don't inhibit flow nearly as much as some think. I've used high performance filters in the past, and I might again in the future. There are many that will be shocked by the results, that should not be though. If you think about it, that conclusion passes any and all common sense tests, so it is not surprising. The poorer flowing filters, remove more particles, and the better flowing filters remove less particles. Really, it is up to each individual to decide. I contend that 1% over many miles, may be important. This may be true, and 1% may not sound like much. I actually received an e-mail from K&N stating their filters filter within 99% of the OEM filters. The "high performance" cotton gauze and foam filters do not filter as well as some have claimed. Well there is a clear pattern on filtration ability compared to both flow and the type of filtration media used. I have read that K&N type filters don't filter quite as well. While increased airflow helps combustion, I think perhaps having less air (cooler) coming in might be better than having more air (hotter) going in? (I left the truck unhooked from the battery for about 30 mins to clear the computer). I expect the carburetor might need to be adjusted for a higher flow filter since it's not EFI like my F150 was. So it would solely be an air filter change since there's no real way to do a cold air intake on this van. I would probably have to leave the OEM air filter housing since it somewhat helps keep the air being taken in cooler than it would with one of those exposed hamburger bun style housings. I am wondering if my 360 might benefit from a Spectre or K&N filter. It may have also helped the MPG but I really didn't pay a whole lot of attention. I'm not sure if the larger intake pipe was what helped or the high flow filter, maybe a little of both. I swear that it felt like it had better power. I had a 99 F150 4.6L V8 that I put a Spectre air filter in and did a simple intake mod that just used a short piece of PVC pipe and a rubber coupler which allowed for more airflow to enter the intake. Even if it means 1/4 of a mile per gallon better. I am looking to stretch every gallon of gas as far as I can.
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