Originally Posted By: Klutch9
My car is also a PZEV, and I installed the CAI myself. What I did was just install a clamp-on cone style filter to the MAF housing (a very popular mod in the Focus community - can be found here
Focus Stealth CAI )
This involves removing the 'lifetime' air filter/housing, then simply clamping the filter on. The O.D. of the MAF housing is an odd 3.25", as most filters have either a 3" or 3.5" I.D. However, I use a 3.5" Spectre filter that is soft enough to make up for that .25" slack and seal perfectly.
Oh, and no silly emissions tests in MI
In fact, since this mod still keeps the factory intake resonator and hydrocarbon trap, in theory this should still be fine for emissions. I honestly never understood why an aftermarket intake causes a car to fail an emissions test... I mean, yes, an aftermarket intake on a little subcompact car MAY increase emissions like 0.00012%, but it still emits WAY less carbons than a 'stock' V8 gas-guzzling SUV. Who knows.
Yup I saw that mod.. that's the one I'm gonna do... I think they have the spectre filter at Autozone or OReilly's by me for like $25. Did you notice any difference in the response of the engine when you changed it out?