I used the same K&N HP-5001 as well. Stupid they were discontinued...

I'm switching to these though as I refuse to use the WIX Racing ones. This "racing" version is built better than the Fram stuff we are used to from what I've read and comparable to the K&N.

Fram HP6A Fram HP Series Oil Filters | Summit Racing

The Fleetguard Stratapore oil filters are amazing.

Keeps my Cummins Common Rail diesel engine oil really clean...never gets non-transparent before my 5k+ mile oil change. With 12+ quarts in the pan/filter.

Not sure if any thread sizes would fit, but surely a custom setup would bolt on easily.

Cat oil filters may be another option.

Most guys are changing oil at 25hrs? Anyone ever do any sampling at the 25hr mark?

System 1 re-usable wire mesh oil filters work well. Get to inspect any potential metals etc. They have various micron screens.

After getting screwed with an oil bypass passing metals, I lean towards a well setup oil system with no bypass. Twin filters or a one large enough to take the pressure is essential.

I've tested oil at several intervals below 25hrs. What I found on my 3.3 whipple engine is that the fuel dilution just begins at around 20+ hours, so I change oil at 20hrs. Metals and contaminants have been very clean with K&N, Moroso, and the Delco filters I've run.

I have been running double Napa Gold 1515 filters on a set of 509s. Recently pulled engines with close to 800 hours. Bearings were in near new condition. Oil changed at 50 hour intervals.

Not bad!

I use a K&N HP-3002 and have been very pleased with it.

Good info! Assuming FI with the 3.3?

What are your F/A ratios like?

Yes it's a fuel injected 3.3L whipple. A/F ratios run in the high 12s to 13 at idle and work their way down to about 11.5 at WOT 8lbs of boost.

I assume it is a 13/16 16 filter and screws right on to the factory remote oil filter housing? Is the Napa gold a WIX filter?

Yes, napa gold is a wix filter.

I use a lot of filters. For work and myself. Mostly Wix.

Here's a concerning one from a few weeks ago.

Look inside. It’s a new, not installed one.