I further tweaked my tune and eventually ended up with a gain of 11hp/13lbft torque over the stock airbox, knock-free.

 

Figured that you would find more power with the open filter, now the numbers look just about right!

 

This was the one i planned to buy but then held off. Vibrant adapter and a 4.5" K&N for $56 http://www.extremepsi.com/store/cust...cat=319&page=1

Here is the Vibrant adapter and Vibrant Filter for $42 http://www.extremepsi.com/store/cust...cat=319&page=1

I rather spend a little extra money and have the peace of mind over the Vibrant imo. I've ran Vibrant parts before and have nothing against them i just like k&n better. After reading this again, I'm sold on picking one of these up eventually.

 

Good info...I'm currently running the vibrant MAF adapter and cone filter within my stock box...obviously the box is cut open on the fender side to fit the filter. I'm tempted to switch to the amsoil filter for better filtering but afraid it will be too long and hit my ACD resevoir...

 

As promised, I changed my oil and got it analyzed by Blackstone Laboratories. I have 873 miles on the Vibrant air filter, and 10 autocross events on this oil change. Everything seems well in line with averages, if not much better. The silicon count was 9ppm, vs 11 for an average 4g63 engine, so I'd say this filter is providing adequate protection. I will do another update after the next oil change analysis to see if it remains consistent. Like others, I was a bit skeptical about the filtering quality of this filter since it flowed so well in other tests, but the lab results have comforted me. I wouldn't have bought this if Buschur Racing had not confidently sold it in their stores.



Here's an explanation of what each metal/mineral count is, from their website:

Aluminum: Pistons, bearings, cases (heads & blocks).
Chromium: Rings, a trace element in steel.
Iron: Cylinders, rotating shafts, the valve train, and any steel part sharing the oil.
Copper: Brass or bronze parts, copper bushings, bearings, oil coolers, also an additive in some gasoline engine oils.
Lead: Bearings.
Tin: Bearings, bronze parts, piston coatings.
Molybdenum: Anti-wear additive, coating on some new rings
(washes off as break-in occurs).
Nickel: Trace element in steel.
Manganese: Trace element, additive in gasoline.
Silver: Trace element.
Titanium: Trace element.
Potassium: Antifreeze inhibitor, additive in some oil types.
Boron: Detergent/dispersant additive, antifreeze inhibitors.
Silicon: Airborne dirt, sealers, gaskets, antifreeze inhibitors.
Sodium: Antifreeze inhibitors, additive in some gasoline engine oils.
Calcium: Detergent/dispersant additive.
Magnesium: Detergent/dispersant additive.
Phosphorus: Anti-wear additive.
Zinc: Anti-wear additive.
Barium: Detergent/dispersant additive.

 

Bringing this thread back up for an update:

I did another oil change and sent it off to the labs again. During this 9 month period, I increased boost another 1-2psi, had the same Vibrant cone air filter in for the entire duration, and autocrossed monthly. Everything is within specs and they're even telling me to extend my use of the next oil change. The Vibrant air filter flows extremely well and also filters extremely well, as noted by the low silicon count (airborne dirt, sealers, gaskets, antifreeze inhibitors). This filter is the best bang for the buck out there for the Evo, not only cuz it's cost is cheap, but it has proven to do its job well!