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Old 07-13-2011, 03:41 PM   #1
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Homemade SRI - I finally did it

I've been thinking, and thinking some more, about whether or not to try a homemade SRI on my 2009 SES. Upon first inspection I could see the only way to modify the MAF tube for a cone filter would be to mutilate it and cut away the portions of the airbox connected to/part of the MAF tube. I've had the 3" inlet cone filter for 3 months or more, stalling in fear of making irreparable damage to the only MAF tube I had. However, today I priced a new air filter at Canadian Tire..... $39.97 (Fram).... that wasn't what I was expecting. So, I purchased a propane torch and nozzle, and went home to tear into the MAF tube. My air filter was getting a little dirty, and I had slight issues with rough idle, and gas mileage starting to dwindle.

Surprisingly, LoL, all seems to have gone well. Once I started to cut away at the MAF tube my nervousness turned to concentration/determination. Easily, although somewhat time consuming, I was able to cut away the top pieces of the airbox from the MAF tube. The edges were rough, so I used the hot knife, a utility blade/razor, and some sand paper to clean the edges. Backyard jobbie for sure, but you can't beat the price.

I'll throw some pics up after I create a photobucket account. Just wanted to show it can be done, and doesn't take much work or money. Once cut apart, the MAF tube was 3", a perfect fit for my filter.



Last edited by Duhamel; 07-19-2011 at 01:13 AM.
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Old 07-18-2011, 05:04 PM   #2
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I took it apart today just to inspect and make sure everything was fine, and it was.












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Old 07-19-2011, 01:02 AM   #3
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And the leftovers...a little grainy, sorry.

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Old 07-19-2011, 02:36 AM   #4
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Quote:
Originally Posted by Duhamel View Post
And the leftovers...a little grainy, sorry.

O NO! you burnt your new Focus! sacrilege!
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Old 07-19-2011, 02:42 AM   #5
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really f# kin duct tape ?
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Old 07-19-2011, 02:51 AM   #6
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I question the duct tape as well... from the picture before it looked like it would seal fine. just curious.
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Old 07-19-2011, 09:26 AM   #7
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really f# kin duct tape ?
LOL, I'm still laughin....yes, I was really concerned about a CEL. I saw someone else got one when they put a homemade SRI on, and I really didn't want one. Plus, I covered the duct tape, lol. Maybe I'll delete that pic.
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Old 07-19-2011, 09:11 PM   #8
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Maybe you should have just used silicone or rtv if you're that worried about it sealing. lol

Duct tape?! Come on bro! Besides that, nice job
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Old 07-20-2011, 12:08 AM   #9
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Lmao @ duct tape. Ftw?
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Old 07-20-2011, 04:24 AM   #10
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All that work just to get some nice warm underhood air into your engine ?



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