I have just recieved my K&N filter (RU 1520) That Andy Recommended To me tho fit on my Alta Intake. IT is GREAT!!! the fit is perfect, the sound is much better (less whooshing, like a 1967 olds 442 w/o an air cleaner) and the performance and S/C whine is as strong as ever. I would definitely recommend the change from the Alta foam to the K&N gauze.
Andy @ Ross tech, thank you again and Minifletch I also appreciate your input. You may want to take a look @ andy's setup. https://www.northamericanmotoring.co...ic=23873&7
Craig

 

One of these days, I'll do some logging to see if there is any flow difference between the UNI (Alta) and K&N filters.

 

I have the new alta intake (no gauze around the filter) will this replacement filter also fit on that?

L

 

No clue, measure the pipe diameter and the amount of space for the filter.

 

Ill see if I can dig it up, but I read this article where a big time japanese tuner did a comparison on filter elements. The results were, atleast for the initial clean filters, that the foam flowed better but let more crap in. So based on that I try to not use foam intake elements.

 

MrWhoa,

I think that's backwards--or at least contrary to the last independent test I could find. I'll see if I can dig it up, but it was essentially that gauze flowed better initially, but loaded up more quickly and passed more material.

I'll post back when I find the reference that I had. It's tough to find independent #'s for these things. If you can find the test please do the same.

Jeff

 

Well, that's embarrasing. I posted on the subject last year. See this for the last time we discussed.

If someone wants to pop for testing some mini-specific filters I'll chip in. It'd be good to get non-sponsored data.

Jeff

 

i am confused...

is this more of a sound/appearance thing, or are there performance gains to be realized from this?

cheers
-ABT-

 

I thought this was more of a "is it better to replace the filter each time or clean it?"

L