No better way to describe it...Thump, Thump, Thump, coming from the air intake. Seams to run fine, but sounds "scary" at best. Sound does increase with engine RPM.
I was thinking possibly the air compressor. At idle air pressure will only hold at 95 psi. Pumped the pressure down a bit and brought idle up and pressure came up to 120 (pop-off).
Any ideas would be appreciated.
Also, does anyone have any idea how much a DT466 in frame is running these days?