I know everyone likes the Radix but I saw one get took down by a whipple 2 weeks ago. There was two silverados 5.3s, an the singlecab had a Radix an the ex. cab had a whipple. The ex. cab(whipple SC) took the reg. cab(radix SC) by 1 truck length the first run an about 3/4 a truck length the 2nd run. So sorry boys but Whipple can carry extra weight an still out run a Radix. So never count whipple out.