Am thinking of springing for the K&N system for my 06 V-6 Taco. From what I've heard, they do seem to provide a noticeable increase in power. Again, from what I've heard, the main drawback seems to be the risk of oil from the reusable filter causing problems with the oxygen sensor.

How significant is this problem? Can it be overcome by reasonable care not to over oil the filter element, or maybe by buying a second element, so each element could dry thoroughly before being re-used?

Are there alternative brands that solve this problem or provide superior performance for my engine?

Finally, headers seem to be the recommended second step to harmonize with increased air intake. What brands would you people recommend? TRD? I want a system that will work with the existing cat and single exhaust.

My goal is a power increase of around 10% without major mods, or voiding the factory warranty. Any general observations along these lines would also be appreciated.

Thanks!