Racepak Adapter for Holley ECU 11100 Fits different body shapes and

Fits different body shapes and sizes and adjusts to different race seats

2001-2003 Chevrolet Silverado 1500 HD 78

Spacers can only be used with wheels that have cut-outs (facing the hub) to clear the stock Studs

2003-2011 GMC Savana 2500

Racepak Adapter for Holley ECU 11100 Fits different body shapes andRacepak Adapter for Holley ECU Racepak LLC was founded in 1984 by Spencer Eisenbarth and Ron Armstrong, originally as Racepak and its parent company, Competition Systems, Incorporated (CSI). Both men were engineers with strong backgrounds in electrical and mechanical applications, and both had an interest in motor sports. Through an earlier joint effort aimed at obtaining data for the improvement of the Unlimited Hydroplane that Armstrong was piloting