For a street motor where reliability is excelent due to the parts used, i would go 51515. Race, 51515r to catch debris should you have a failure and metal floting around. With the higher flowing media, the r filter doesn't bypass the oil nearly as quickly, lncreasing the chance to catch the junk.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky