Kind of. There is a significant amount of valve overlap built into the profile of the Tuner Stage 2 camshafts. When used on boosted engines a percentage of the boost generated will be bled off through the exhaust valves on the intake stroke resulting in more turbo "lag," as well as force the turbo to work harder to make the same amount of boost. You COULD use adjustable cam gears to dial out much of that overlap; however, the gains seen by using the larger camshafts would be negated because the centerlines of the camshafts would be incorrect.