K&N air filters

I used K&N in a few vehicles. I had a fuel system issue on my 00 Taco that the dealer just could not get resolved. They reached out to Toyota engineers for help. The engineers had select parts sent off to California for analysis. The engineer spotted the problem in a part that wasn’t even on his bench and he said that I either had a damaged air intake or I was using an after market air filter such as K&N or something similar. Sure enough the problem was resolved and K&N never graced another on of my air boxes.
 
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