K&N or UNI
I had a wonderful chat with the bloke who kicked off UNI FILTER is Australia.
At one stage he was selling UNI's to blokes who raced Baja and similar desert races. These blokes where getting contingency money from K&N for finishing in the top placings, and using K&N products.
They were putting a smaller UNI inside the K&N filter, and it was coming out dirty at race end !! Once they started using UNI, their engine life increased.
That said, pleated paper filters ( original equipment ) provide better filtration, and provide cleaner air to the motor.
theres my $0.02 worth
gregGS