Mesquite
The Baldwins that PTE supplied for years had a 20 psi bypass in them. I think the typical GM bypass was about 4 psi.
I am pretty sure that mine came with a WIX filter. AND maybe the WIX has a hi-psi bypass as well. I'm not sure but I do know that they did/do list one of the functions of the TurboSaver is always supplying the engine/turbo with filtered oil. Its been a few years since I've installed it and I do not remember the details of how they accomplished the feat.
I have been grilling primarily with Propane lately because of the conveinence. I do have one of those dual zone grills that has a charcoal side and a gas side. I will have both sides fired up for Thanksgiving. When using the Charcoal side I prefer the Jack Daniels charcoals with the hicory chips. I prefer my steaks done on the propane side as I can get the temps up higher and keep them more consistant. My steaks are cooked in roughly 3 minutes on the propane side.
