Brettus cold air intake
 

DIY cold air intake. Made this a while back from a few bits and pieces. Pretty cheap to build , makes a loud induction noise and very effective at keeping intake temps down !

Build list :

Filter K&N RU 1785 (not same as pictured as that is just what I had laying around)

1x long radius 3.5" Al. bend

1x 3.5" silicone coupler

4x 3.75" hose clips or T bolt clamps

1x maf tube not same as pictured as mine was home made but this one will work : [[url=https://www.treadstoneperformance.com/product.phtml?p=103762&cat_key=467&prodname=DENSO+ MAF%2C+Mass+Air+Meter+Pipe%2C+Subaru%2C+Scion%2C+M azda%2C+Toyota%2C+Lexus&fbclid=IwAR2lFN2LZgIzbkkHj MPmNyF5fXtKsDYMjyeVsWy05ccg1JXx_SZVSx1GUrk]https://www.treadstoneperformance.com/product.phtml?p=103762&cat_key=467&prodname=DENSO+ MAF%2C+Mass+Air+Meter+Pipe%2C+Subaru%2C+Scion%2C+M azda%2C+Toyota%2C+Lexus](https://www.treadstoneperformance.com/product.phtml?p=103762&cat_key=467&prodname=DENSO+ MAF%2C+Mass+Air+Meter+Pipe%2C+Subaru%2C+Scion%2C+M azda%2C+Toyota%2C+Lexus)

1x 3.5" Maf honeycomb straightener (recommended but not essential)

may need more 3.5" pipe and another coupler as don't think the Treadstone maf tube is as long as mine by the look.

*Ensure the 90 bend pipe is perfectly aligned with the maf tube to avoid tuning issues!

**Also : tube of silicone to form a bead above filter on steel reinforcement above so that water wont drip into filter!

*** I have found the fuel trims have stayed very low and the tune has not been affected much but as a tuner ...of course I have tuned it! As with ALL aftermarket intakes I recommend a tune after fitting or at the very least check AFRs via an obd scanner!

https://cimg5.ibsrv.net/gimg/www.rx8...695117988d.png

Edit , added the word 'loud' in description.

Thanks for the awesome DIY.
I’ve been wondering about the Brettus Speed CAI for a long time.

Great stuff Brett

This is what I used for a filter (it's a bit smaller) but fit nicely RU-3130-L

Your link to the maf tube and honeycomb air straightener returned a 404 (try this one: Denso Maf Tube with Honeycomb air straightener) for me but I happen to have one those installed which gives a perfect idle ... so smooth. (TeamRX8 pointed me to this awhile ago. Thanks Team)

EDIT: You need to purchase the Maf Airflow Straightener separately

EDIT EDIT: OH OH ONE MORE THANG! I recently had spent quite a bit of time digging through Treadstone's online store and adding items to my cart. (500 cdn or so)
When I went to check out they wouldn't ship to Canada. Which I can't explain as I have quite a few pieces from Treadstone.
I even tried contacting them and had no reply.
So there's that, I've since been sourcing my material for other places.

Thanks for the feedback ! did you use this on your turbo setup ? Did you use a silicone couple to get the bend or make something up ?

Yes on my turbo setup. That maf tube and straightener made a really big difference.
Correct I currently have a silicone couple to make the bend which is not as pretty by any stretch of the imagination but provides some flexibility.
But I like what you have here so come winter (sigh which is coming soon) I will try and make it all pretty.
And I found a guy just around the corner who does aluminum welding, so hopefully I can do a few more beautification mods.

Yeah , the maf straightener makes a huge difference if there is anything to cause turbulence remotely close to the sensor .EG , a bend , a join, a change in diameter , any misalignment , a turbo etc. With the setup above ...I didn't need one because I made sure the join is perfectly aligned and there is such a long straight section before the maf .

The Treadstone MAF housing is definitely shorter and needs another piece of pipe, which kinda stinks. Not a huge deal, but it would have been nicer for straighter airflow to have a longer MAF housing. I used a straightener and it's been fine. Idles smooth and pulls strongly. Obviously it needs a MAF rescale vs the stock housing...

https://i.postimg.cc/432yVRs9/image.png

https://i.postimg.cc/CKTwFZBT/image.png

True for your application. Though by integrating it into a shorter section Treadstone knew that they gain use, and therefore increase sales, for turbo / SC applications, which likely require a shorter section.

stop trying to reinvent the wheel already. You buy a piece of 3.5” OD aluminum tube, the weld on MAF sensor adaptor, size & cut the tube length, position the MAF sensor, hole saw the hole, and have it welded on. You can put straighteners in the ends, but I never ran any and had zero issues.

again, this is as old as the forum itself.
.

Remember *Brew*tus? :) Cheers man!

Hey man ! I sure do ...wow that was a looooong time ago ! Didn't think you were still on here!
https://www.rx8club.com/nw-rx-8-foru...2/#post1982422