Correct this is a race filter , probably has higher burst strength case? Probably to be used with a plugged bypass adapter or none.I have been told dont run the racing filter on the street due to its not as fine a filter.
For me, my oil pressure went up when I had a blocked bypass and a fram filter. When I later changed to napa gold, oil pressure stayed the same until I put the stock bypass back into as I felt I had too much pressure cruising and was thinking of washing out a bearing. I have seen it but never experience it. Don't want to either. Current psi with my melling hi volume 10555 pump is 40 psi idle hot, 55 running hot at 2300 rpm, but remember if psi gets too high, the oil pump bypass will open.Will the oil pressure go up or down with the R version? My bypass is blocked and I run the regular wix, but would like more oil pressure