Well just bought my 08 Bullitt yesterday and noticed a bad thing. I thought the CAI filter was a reusavle one. After reading the manual I see that it has to bereplaced when it is dirty. Knowing this I want to replace it with a K&N, does anyone know which K&N model number filter will be the best fit behind the heat sheild.

 

Personally I'd keep using the paper type.

 

you dont have to replace the entire intake! just go out and purchase an reusable air filter. by the time the stock one gets dirty thier will be multiple filters on the market that can be re-used!

 

Agreed. Keep the stock one in there until it is dirty. That will probably be 15-20K miles anyway, so you have plenty of time on the stock filter. Once that one is dirty, I would suggest looking into the Amsoil conical filters. There is a link to them in my signature, check them out. Just do some measuring of the stock filter and find the Amsoil one that most closely matches.

 

And go register that baby on www.imboc.com !

 

Why? Paper filters suck... That intake setup is begging for a K&N style filter.

 

Why do paper filters suck? Stock paper panel filters are different than this one. A stock paper panel filter will flow less air than a conical K&N style one, but will provide better filtration of dirt which causes wear on engine parts. So, better is just a relative term. Do you want airflow, or do you want better filtration?

You could go with the Amsoil one like I suggested and get both excellent filtration AND airflow.

 

Motorcraft filters are quality, and compare closely to K&N style with the exception that the Motorcraft paper filters better, and doesn't foul MAF.

 

Where do I fint the Amsoil filters at? Why are they better than K&N?

 

http://www.amsoil.com/StoreFront/eaau.aspx

The advantages over a K&N are there is no oil involved, so there is no possibility of an over oiled filter screwing up your MAF, and they filter smaller particles of dirt, leading to a cleaner engine, and less wear since a lot of wear comes from dirt ingestion from the intake.

To clean the Amsoil filter, you just blow air through it or use a shop vac to suck the dirt out. No oil or other mess when it's cleaning time.

I don't know what size the stock filter is, so you would have to measure it to find the correct size.

With the stock filter being a dry one (no oil required) it is probably very similar to the Amsoil or AEM Dryflow filters, and you would likely not get much of a benefit from either over the stock filter. It would be a waste to throw out the stock filter to replace it with another equally effective and functional filter. That is why I say wait until the stock one is dirty and needs to be thrown away anyway...then go aftermarket.

 

i just want an aftermarket one because over the lifetime of the car a reusable filter will save me money

 

That is true. Once the stock one is used up switch over to the reusable filter of your choice.

 

Well... it seems you answer your question in your statement.... Get the Amsoil after market filter - which is better then a paper one. And no, a K&N does not let more dirt through then a paper filter - nor does it foul your MAF - it only will if you don't know what you're doing and oil the **** out of it.

 

OH if that is true then I will stick with a K&N.

 

Quoted from Amsoil's website:

"Ea Air Filters’ synthetic nanofiber media removes 5 times more dust than traditional cellulose filter media alone and 50 times more dust than wet gauze filter media. "

Amsoil seems to think wet gauze (K&N) filters less dirt than cellulose (paper) filters.

 

I just bought a Bullitt CAI for my GT. I will be switching to the Amsoil filter when mine gets dirty. Amsoil's filtration is much better then K&N. I have researched both. K&N does a lot of marketing, generates a lot of hype, but in reality doesn't filter as well. Yes, it may flow a little better. But that's exactly why it flows better - it doesn't filter as well. I'll give up a little bit of flow for a cleaner engine.

I have no affiliation with Amsoil. I've just done my homework, talked to engine builders, etc.

 

Very well said JonW. By the way, I stole your avatar I liked it so much.

 

so do you know what model Amsoil filter fits my CAI? their website is a little confusing

 

You will have to measure it to find out what size it is, I don't know how big the filters are on the Bullitt's. Once you measure it, just go here: http://www.amsoil.com/products/ea_fi..._and_Specs.pdf and find one that matches the measurements. Make sure the flange ID (inner diameter) and the overall length are the same, those are the crucial measurements.