what size filter?

[spieluhr]

hey, im gonna make my own ram air intake , and was curious as to what size air filter i should buy.

also, what did you do with teh coolant lines that went to the OEM air filter box? drill a hole and put the "thing" (sorry, dont know what its called) back in the air intake tube? anyway, any suggestions, possible complications from those of you that have done it, would be greatly appreciated!

[CiscoKid]

3.5"

green filter

[Autotechnica]

What motor do you have?

It doesn't actually matter how big of a filter you put in. Your motor will only suck in so much air anyways. Just make sure it's properly shielded from the engine's hot air and that the filter isn't too small. Get a 6" cone K&N filter with a 3" opening. If you have a 325, you would have to drill a hole in the tubing to stick the sensor plug back in. If it's a 318, you can only attached a filter to the MAF, you can't use more tubing.

Bry

[mikester328]

Get a 6" cone K&N filter with a 3" opening. If you have a 325, you would have to drill a hole in the tubing to stick the sensor plug back in. If it's a 318, you can only attached a filter to the MAF, you can't use more tubing.

I have a '96 318... would what you said about the 318 go for my year or just the earlier years?

[Autotechnica]

Originally posted by mikester318@May 22 2004, 07:41 PM

I have a '96 318... would what you said about the 318 go for my year or just the earlier years?

Yep, the 6" filter works great with any year 318. It's used in Bav auto and BMPD's kits as well.

Bry

[spieluhr]

i have a 325 btw, and today i went to schucks and bought a K&N filter and was talkin to my dad about just bolting it on to the old plastic attatchment that attached to the stock air box. i cant build a ram air intake b/c for some reason there are horns in the way (beep beep horns). would you suggest a heat shield? whats the easiest way to get one or build on, and are there any specs. for one?

[Autotechnica]

Originally posted by spieluhr@May 23 2004, 02:25 AM
i have a 325 btw, and today i went to schucks and bought a K&N filter and was talkin to my dad about just bolting it on to the old plastic attatchment that attached to the stock air box. i cant build a ram air intake b/c for some reason there are horns in the way (beep beep horns). would you suggest a heat shield? whats the easiest way to get one or build on, and are there any specs. for one?

Cut the bracket and relocate the horn. That's what everyone else (including me) did :wink

Bry

[spieluhr]

any detailed instructions on this? i was leaning towards just building a standard Air intake w/ a heat shield, but the heat shield sounds like a lot of work, i just dont know what to do with the horn, or where to put it.

[skawful]

you can take the horn out completely or relocate it
i hear it is not too complicated

[spieluhr]

also, is this site...

http://www.bmw-m.net/TechProc/diy_ram_air.htm

a good way of doing it? instead of having to buy more piping and have it bent just feed the air tube into the brake duct?

[Kevin325i]

I was going to do something like this. Buy my plan was to only use part of the air coming in because I imagine those ducts help the brakes. Like cut a hole in the top and sneak part of the tube into it. Then run the other end of the tube up into my air box. But where to put the horn, hmmmm.

Kevin

[Autotechnica]

Note where I relocated the horn. Use a peice of metal and just bolt it onto one of the holes on that metal peice located near the intake.

Bry