You should be able to make a hose from the snorkel to the box inlet.

You want an even light coat of oil on the filter and then throw some dust on it to dirty it up.

Well my latest MPG figures are in. I recently drove to Chicago and back 245 miles mostly 65-70 with the AC on about half the time, and about 1.5 hours of stop and go, used 8.53 gals = 28.7 MPG!!. That is an all time high for me, usually it is closer to 24-25 range. I can say with confidence this gave a solid 3 MPG increase. Incidentally, odometer seems to be within 1% according to a 60 mile stretch of freeway.

That's great! There's a lot of satisfaction to doing a mod with so many benefits. Do you have a boost gauge? Do you have any before/after boost level data? How many PSI you running at highway cruise?

Yes, boost was 2-3 cruising at 65 with AC. Boost was in the same 2-3 psi range at 70 without AC. EGT was about 650 *F Exhaust pressure was around 8 psi.

Interesting. My setup with the same turbo puts out 4-5 psi at 65 mph, but my exhaust pressure is 6-7 psi.

Really. Cruising with 2-3psi, the exhaust should be under 5psi. Exhaust:boost pressure ratios above 2:1 are not great for efficiency.

Well the gauge is a 100 psi gauge, so low ranges are probably not very accurate. Also, I wonder if the measurement location has anything to do with this discrepancy. I am measuring this pressure in the necking region between the manifold and the turbo flange. The pressure would naturally tend to increase in this region. Maybe I will try to measure it in the EGR port and see what I get.

That could be why. Gauges are least accurate in their extreme (high and low) measurement ranges.

How about your pre-mod cruise boost levels-how do they compare to your current levels?

I made a quick measurement of the exhaust pressure last night in the EGR port. These measurements were closer to what bgkast reported: 3-4 psi boost 8 psi exhaust; 11 psi boost 20 psi exhaust. I also made a quick manometer and measured the pressure drop across the filter. 11 psi boost 4500 rpm the vacuum was 2.5" H2O. That's pretty good in my book. Pre-mod boost at 65 was in the 4-5 psi range.

What model VNT turbocharger?

Garrett GT2056V off of a jeep liberty CRD

Whats the max boost the Garrett GT2056V can run? I'm assuming the Jeep guys are running over 20psi tuned. Whats your max PSI you see on your Mercedes?

I run a max of 15 psi right now. It can put out much more, but I don't have the fuel to use it.