Level VI Member
Join Date: Jan 2017
Location: Fort Worth Texas
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K&N is the biggest farce on the planet. I sold plenty of them though. I remember buying them for motorcycles way back before they became well known to raise their prices 500%.
They are very hard to get the oil amount right in them. Best way is to slightly over-oil then set it on something the oil won't hurt and then let it sit 3 days to drain to only what gets held in the gauze by capillary action as designed. Otherwise you kill the MAF action until the filter has 'sucked down' to the normal oil level that stays retained in the gauze. That can often burn excess oil on plug tips to miss then too. Once you have run the filter for a while take it out and hold the matrix up to the light and look through it. All those specks of light you see are holes that dirt can freely get through if small enough the speck does not touch the side of hole to stick on the oil.
They stop lots of dirt but they also let lots get by, I found that out on dirt bikes way back, the engines kept dying from dirt wear in dusty conditions.
Better to use foam filters, they do the same but the thicker media forces the air to twist all over the place and much more likely to stick the dirt inside filter where it belongs, they hold more oil and longer too.
Like pointed out any MAF re-location if necessary can easily kill you too, they need to be in a very carefully chosen spot to work best. Any change to MAF location tube ID and the MAF is automatically out of calibration to be wrong, wrong, wrong. That is MUCH more important than the TB size per se.
Last edited by amc49; 02-26-2017 at 07:59 AM.