Mod to a 4.6 seems, based on what I've read, like not such a great idea as it will pull hot air from the engine bay as well as mess up the MAF reading.
Anyone have any experience in this regard? Is it a yay or nay?
If you, or any other forum member, decides to use a K&N filter, it is imperative that you oil it properly after cleaning. Use K&N filter oil, let the oil spread, then re-oil any white spots. Additionally, I use a light coating of grease around the rubber seal where it mates with the air filter housing. I have used K&N's for many years off road in Baja. They work well under extreme conditions, but I wonder about their value for street use.
Bert is absolutely right. I should have mentioned to not over oil the filter. I try to let mine sit overnight so the oil can soak in and any excess can be wiped off before installation.
One additional point, hot intake air does not result in better fuel mileage. It just results in less horsepower. In a closed loop system, the MAF will read less airflow (along with the 02 sensor mixture reading) when the air is less dense (hot) and the ECM will reduce the fuel mixture to stay "stoich" (stoichiometric).
My '00 Grand Marquis had a CAI on it when I bought it. The only difference I made, was to take off the filter (don't know what brand it was), and put on an Amsoil powersports cone filter. More flow than a K&N, plus NO OILING!! It's a dry filter, that only requires an occasional blow out with an air compressor, or vacuuming (if you don't have an air compressor). I've been satisfied with it, no complaints. I don't know if there was any 'tuning' done to it, as I bought the car that way, but the wife's been getting a constant average of at least 24 mpg's with it, driving it back, and forth to work. There's my 2 cents worth!
__________________ 2000 Mercury Grand Marquis LS (Mauarder "Clone") NEW!
1968 Cougar XR-7 302 CI 4bbl
1977 Ford LTD Landau (with fender skirts!) 400 M CI
At a recent car show, I saw a few ideas for minor mods if you're interested in going with a cone style CAI, on an early 50's vintage, there was room on either side of the radiator and they routed the cones through the support wall. On a 70's vintage Cougar, they had cold air boxes penetrating the wheel wells. Just a couple of "out of the box" ideas for you.
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