Brought a throttle body spacer, knock off K&N filter, and 08 air intake tube. Big improvement on acceleration and gas mileage. Was getting 12mpg in heavy city stop/go…now I’m averaging between 15-16 in the city. But you do go thru gas much faster stepping on it.
I got a K&N filter and I like it, though it ended up being a tad on the large side. I don't think it matters much compared to any other cone filter, but that's just me
Ran a K&N for years in my Focus SVT, put on a supercharger and blew it up…with 110,000 K&N filter miles the cylinders still had cross hatching. I suspect that means the filter did its job
I've been using the K&N for three years.
I swap it for a new one every couple of years because washing it and re-oiling it is a pain and an art form! As the K&N cost twice as much as the paper filter but I keep it twice as long, it doesn't cost me more money.
The power gain is probably 0.0001%. but the filter changes the noise of your engine ever so slightly, it's slightly more aggressive. I'm about to have a Racing Beat ram air duct fitted which will add another 0.5 HP and some more aggressive noises.
On a serious basis, your car will breathe slightly batter with the K&N, so that's a benefit.
The K&N can "leak" some oil and it doesn't filter small particles as well as the paper filter. This means your MAF sensor is at risk of being contaminated. But I have it cleaned twice a year when I get the car serviced, so that solves/avoids this particular problem.
All in all, go K&N!!!!
I swapped all this, gas pedal, coil packs and checked all plugs, throttle body with TPS and IAC all as one unit, fuel pump, filter is already new. I did one thing at a time then test drove it, nothing made a difference in the issue. So I thought let me go back to the 2008 MAF, (had the 2006 MAF in it), I'll clean the 2008 MAF real good, and run with the Cone style K&N filter off. It took a few miles but it was a near instant fix, it ran perfect. I stopped and put the K&N Cone style air filter back on and drove 3 more miles, and it started to act up again and stalled on a slow turn. So I put the OE Air Filter box and tube etc.. back on, and WALLA!! It runs perfect. It was totally an Air Delivery issue!
DIY 7500mi interval engine oil using 5qt bottle of Mobil1 0w-20 fuel economy oil (takes the whole thing), a K&N HP-1008 filter (why, because it's so easy to wrench off every time), and a new 9956-41-400 aluminum washer.
IMHO the performance gains from the K&N are marginal at best, especially on a 1.8 litre motor. It's less hassle to just replace the paper filter element every year with a freash one than cleaning the cotton filter annually. the K&N will likely require eight years to get your return on investment. Besides it you live anywhere where it's dusty you going to be doing your motor harm... I read about farm trucks with these installed the puke their motors because fine particles are getting into the motor. YMMV.
I just did the switch to a K&N filter recently on mine. Did not notice any difference. I remember feeling a greater difference in my VR6. Maybe its the fact one is N/A and the other F/I.
I've been an OE filter fan since about 1999. Then I had an '87 Carrera and built a killer NA motor, Euro pistons, SC cams, ARP bolts everywhere, Ti bits, SSI headers, custom muffler, a custom Autothority chip, and a big fat K&N air filter. I was detailing the car for a concourse and removed the K&N. The intake runner was covered in gritty dust/dirt.
I wouldnt use the k&n though. They dont offer any real advantage and the oil a k&n uses can foul the air mass sensor.
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