OTR Filters Round Pit Tuning Air Filter Element - 6.625 in Diameter - 3 in Tall - Gray - Holley 4150 Flange Rocker Cover Reduces need for octane by

Reduces need for octane by up to two points

Impala 1996-1994

5 db Gain for excellent range

7/8-14 in Left Hand Female Thread

That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands

OTR Filters Round Pit Tuning Air Filter Element - 6.625 in Diameter - 3 in Tall - Gray - Holley 4150 Flange Rocker Cover Reduces need for octane byProduct Description: Air Filter Element Round Pit Tuning 6. 625 in Diameter 3 in Tall Paper Gray Holley 4150 Flange Sold Individually US based OTR Filters was founded on developing air filtration solutions that help engines breathe easier, run faster, and perform at their best. With a wide range of filters for everything from street performance to hardcore racing, OTR Filters combines excellent performance with maximum engine protection.