Truthfully, the standard 2.5" tall paper filter supplied with the WFO flows just fine.
Not to be condescending, as I value each one of you who use my product...... I know this K&N and air-raid stuff is all the rage but I've done plenty of track testing with $pricey$ filters, paper filters and NO filters. The difference is miniscule, we are talking hundredths/sec. in the 1/4 mile times.
If your skeptical, let me offer this bit of information.......my T/A runs mid-11's @119.
Do the math on HP vs. 1/4 mile ET.
There's really NO benefit using after market filters.
Study the contours of the WFO, both the lid and the base.......large radial curves, no sharp turns do disrupt airflow to the carb venturi's.
Check out what the NASCAR guys use when it comes to design and airflow....and those engines are turning 9,000 RPM.
